/*
Author: haze
2023/11/13
16:27
*/

#include <bits/stdc++.h>

#define irep(i, l, r) for(int (i) = (l); (i) <= (r); ++(i))
#define drep(i, r, l) for(int (i) = (r); (i) >= (l); --(i))
#define ll long long
#define LL __int128
using namespace std;

inline ll read() {
    char ch = getchar();
    ll s = 0;
    bool w = 0;
    while (!isdigit(ch)) {
        if (ch == '-')w = 1;
        ch = getchar();
    }
    while (isdigit(ch))s = (s << 3) + (s << 1) + (ch ^ 48), ch = getchar();
    return w ? -s : s;
}

inline char rc() {
    char ch = getchar();
    while (1) {
        if (ch >= '!' && ch <= '~')return ch;
        ch = getchar();
    }
}

template<class T1, class T2>
T1 min(T1 AA, T2 BB) { return AA > BB ? BB : AA; }

template<class T1, class T2>
T1 max(T1 AA, T2 BB) { return AA < BB ? BB : AA; }

const int itinf = 1e9;
const ll llinf = 4e18;
const int mod = 1000000007;
const int N = 500009;

struct point{
    ll x, y;
    point(){}
    point(ll _x, ll _y){
        x = _x, y = _y;
    }
    point operator -(const point & A){
        return point(x - A.x, y - A.y);
    }
    point operator + (const point &A){
        return point(x + A.x, y + A.y);
    }
    ll operator ^(const point& A){
        return x * A.y - y * A.x;
    }
    ll operator *(const point& A){
        return x * A.x + y * A.y;
    }
};
double theta(point A, point B){
    return acos(1.00 * (A * B) / sqrt(A.x * A.x + A.y * A.y) / sqrt(B.x * B.x + B.y * B.y));
}
int sgn(ll x){
    return x == 0 ? 0 : x > 0 ? 1 : - 1;
}
int main() {
    int n = read();
    vector<point>a(n);
    double t = 0;
    irep(i, 0, n - 1){
        ll x = read(), y = read();
        a[i] = point(x, y);
    }
    irep(i, 0, n - 1){
        int i1 = i, i2 = (i + 1) % n, i3 = (i + 2) % n;
        if(((a[i2] - a[i1]) ^ (a[i3] - a[i2])) == 0){
            puts("No");
            return 0;
        }
        t += theta((a[i2] - a[i1]) , (a[i3] - a[i2]));
    }
    if(abs(t - 2 * acos(-1)) < 1e-8)puts("Yes");
    else puts("No");
    return 0;
}