#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
#define debug(fmt,...) fprintf(stderr, fmt,##__VA_ARGS__)
#define debugln(fmt,...) fprintf(stderr,"[%d] " fmt,__LINE__,##__VA_ARGS__)
#define TIME (1e3*clock()/CLOCKS_PER_SEC)
bool memBeg;
template<typename T> void chkmin(T &x,T y) {x=min(x,y);}
template<typename T> void chkmax(T &x,T y) {x=max(x,y);}
constexpr int mod=998244353;
void inc(int &x,int y) {x+=y; x-=(x>=mod)*mod;}
void dec(int &x,int y) {x-=y; x+=(x<0)*mod;}
constexpr int add(int x,int y) {return (x+y>=mod)?x+y-mod:x+y;}
constexpr int sub(int x,int y) {return (x<y)?x-y+mod:x-y;}
constexpr int quick_pow(int x,ll times,int ret=1) {
    for(;times;times>>=1,x=1ll*x*x%mod) if(times&1) ret=1ll*ret*x%mod;
    return ret;
}
struct point {
    ll x,y;
    point() {}
    point(ll _x,ll _y): x(_x),y(_y) {}
    point operator+(const point &o) const {return point(x+o.x,y+o.y);}
    point operator-(const point &o) const {return point(x-o.x,y-o.y);}
    point operator*(ll o) const {return point(x*o,y*o);}
    friend point operator*(ll u,const point &v) {return v*u;}
    friend ll dot(const point &u,const point &v) {return u.x*v.x+u.y*v.y;}
    friend ll cross(const point &u,const point &v) {return u.x*v.y-u.y*v.x;}
    point operator~() const {return point(-y,x);}
};
struct ray {
    point o,d;
    ray() {}
    ray(const point &_o,const point &_d): o(_o),d(_d) {}
};
ll div_dn(ll u,ll v) {
    if(u>=0) return u/v;
    return -((-u+v-1)/v);
}
int crossl(const ray &l1,const ray &l2) {
    ll up=cross(l2.o-l1.o,l2.d)*l1.d.x,dn=cross(l1.d,l2.d);
    return l1.o.x+div_dn(up-1,dn);
}
int crossd(const ray &l1,const ray &l2) {
    ll up=cross(l2.o-l1.o,l2.d)*l1.d.x,dn=cross(l1.d,l2.d);
    return l1.o.x+div_dn(up,dn);
}
int crossr(const ray &l1,const ray &l2) {
    ll up=cross(l2.o-l1.o,l2.d)*l1.d.x,dn=cross(l1.d,l2.d);
    return l1.o.x+div_dn(up,dn)+1;
}
int crossu(const ray &l1,const ray &l2) {
    ll up=cross(l2.o-l1.o,l2.d)*l1.d.x,dn=cross(l1.d,l2.d);
    return l1.o.x+div_dn(up+dn-1,dn);
}
int cross0(const ray &l1,const ray &l2) {
    ll up=cross(l2.o-l1.o,l2.d)*l1.d.y,dn=cross(l1.d,l2.d);
    return l1.o.y+div_dn(up-1,dn);
}
int cross1(const ray &l1,const ray &l2) {
    ll up=cross(l2.o-l1.o,l2.d)*l1.d.y,dn=cross(l1.d,l2.d);
    return l1.o.y+div_dn(up,dn);
}
int quadrant(const point &o) {
    return (o.y<0)<<1|((o.x<0)^(o.y<0));
}
bool check_anti(const point &u,const point &v) {
    return cross(u,v)>0;
}
bool polar_cmp(const point &u,const point &v) {
    int pu=quadrant(u),pv=quadrant(v);
    if(pu!=pv) return pu<pv;
    return check_anti(u,v);
}
bool upper(const ray &l1,const ray &l2,const ray &l3) {
    return cross(l2.o-l1.o,l2.d)*cross(l1.d,l3.d)>cross(l3.o-l1.o,l3.d)*cross(l1.d,l2.d);
}
ll calc(ll n,ll a,ll b,ll c) {
    if(abs(b)>=c) {
        ll whole=b/c;
        return n*whole+calc(n,a,b-whole*c,c);
    }
    if(b<0) {
        return -n+calc(n,a,b+c,c);
    }
    if(abs(a)>=c) {
        ll whole=a/c;
        return n*(n+1)/2*whole+calc(n,a-whole*c,b,c);
    }
    if(a<0) {
        return -n*(n+1)/2+calc(n,a+c,b,c);
    }
    if(a==0) return b/c*n;
    ll m=(a*n+b)/c;
    return m*(n+1)-calc(m,c,-b+a-1,a);
}
constexpr int V=2000;
constexpr int maxn=15;
int n;
point pt[maxn];
ray ln[maxn],que[maxn];
pii half_plane() {
    int tead=1,rail=1;
    for(int i=0;i<n;i++) {
        while(rail-tead>1&&upper(que[rail-2],que[rail-1],ln[i])) rail--;
        while(rail-tead>1&&upper(que[tead],que[tead+1],ln[i])) tead++;
        que[rail++]=ln[i];
    }
    while(rail-tead>2&&upper(que[rail-2],que[rail-1],que[tead])) rail--;
    if(rail-tead<=2) return {0,0};
    if(cross(que[tead].d,que[tead+1].d)<=0) return {0,0};
    for(int i=0;i<n;i++) if(upper(que[tead],que[tead+1],ln[i])) return {0,0};
    return {tead,rail};
}
bool memEn;
void fl() {
    freopen(".in","r",stdin);
    freopen(".out","w",stdout);
}
int main() {
    debug("%.24lf\n",fabs(&memEn-&memBeg)/1024.0/1024.0);
    // fl();
#ifdef LOCAL
    freopen("debug","w",stderr);
#endif
    scanf("%d",&n);
    for(int i=0;i<n;i++) {
        scanf("%lld%lld",&pt[i].x,&pt[i].y);
    }
    reverse(pt,pt+n); pt[n]=pt[0];
    ll ret=0;
    for(int i=0;i<=V;i++) {
        for(int j=1;i+j<=V;j++) {
            for(int k=0;k<n;k++) {
                point d=pt[k+1]-pt[k],o=pt[k],v(i,j);
                for(point no:{pt[k]+v,pt[k]+~v,pt[k]+v+~v}) {
                    if(check_anti(d,no-o)) o=no;
                }
                ln[k]=ray(o,d);
            }
            int L,R; tie(L,R)=half_plane();
            if(L==R) continue;
            que[L-1]=que[R-1]; que[R]=que[L];
            for(int k=L;k<R;k++) {
                if(que[k].d.x>0) {
                    ll l=crossr(que[k-1],que[k]),r=crossl(que[k],que[k+1]);
                    if(l>r) continue;
                    ret-=calc(r-l+1,que[k].d.y,cross(que[k].d,que[k].o)-1+l*que[k].d.y-que[k].d.y,que[k].d.x);
                } else if(que[k].d.x<0) {
                    ll r=crossl(que[k-1],que[k]),l=crossr(que[k],que[k+1]);
                    if(l>r) continue;
                    ret+=calc(r-l+1,-que[k].d.y,cross(que[k].o,que[k].d)-(l-1)*que[k].d.y,-que[k].d.x);
                }
            }
            vector<pii> dn;
            for(int k=L;k<R;k++) {
                ll l=crossd(que[k],que[k+1]),r=crossu(que[k],que[k+1]);
                if(l<r) continue;
                if(que[k].d.x>0||(que[k].d.x==0&&que[k].d.y<0)) {
                    if(que[k+1].d.x<0) {
                        dn.emplace_back(l,cross1(que[k],que[k+1]));
                    }
                    dn.emplace_back(l,-cross0(que[k],que[k+1]));
                } else {
                    if(que[k+1].d.x>0) {
                        dn.emplace_back(l,-cross0(que[k],que[k+1]));
                    }
                    dn.emplace_back(l,cross1(que[k],que[k+1]));
                }
            }
            sort(dn.begin(),dn.end());
            for(int k=0;k<(int)dn.size();k++) {
                if(!k||dn[k]!=dn[k-1]) ret+=dn[k].second;
            }
        }
    }
    printf("%lld\n",ret);
    return 0;
}
/*
g++ template.cpp -o template -std=c++14 -Wall -Wextra -Wshadow -fsanitize=address,undefined
*/