#include<bits/stdc++.h>
namespace my_std{
	using namespace std;
	#define pii pair<int,int>
	#define pll pair<ll,ll>
	#define fir first
	#define sec second
	#define MP make_pair
	#define rep(i,x,y) for (int i=(x);i<=(y);i++)
	#define drep(i,x,y) for (int i=(x);i>=(y);i--)
	#define go(x) for (int i=head[x];i;i=edge[i].nxt)
	#define templ template<typename T>
	#define sz 333333
	typedef long long ll;
	typedef double db;
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	templ inline T rnd(T l,T r) {return uniform_int_distribution<T>(l,r)(rng);}
	templ inline bool chkmax(T &x,T y){return x<y?x=y,1:0;}
	templ inline bool chkmin(T &x,T y){return x>y?x=y,1:0;}
	templ inline void read(T& t)
	{
		t=0;char f=0,ch=getchar();double d=0.1;
		while(ch>'9'||ch<'0') f|=(ch=='-'),ch=getchar();
		while(ch<='9'&&ch>='0') t=t*10+ch-48,ch=getchar();
		if(ch=='.'){ch=getchar();while(ch<='9'&&ch>='0') t+=d*(ch^48),d*=0.1,ch=getchar();}
		t=(f?-t:t);
	}
	template<typename T,typename... Args>inline void read(T& t,Args&... args){read(t); read(args...);}
	char __sr[1<<21],__z[20];int __C=-1,__zz=0;
	inline void Ot(){fwrite(__sr,1,__C+1,stdout),__C=-1;}
	inline void print(int x)
	{
		if(__C>1<<20)Ot();if(x<0)__sr[++__C]='-',x=-x;
		while(__z[++__zz]=x%10+48,x/=10);
		while(__sr[++__C]=__z[__zz],--__zz);__sr[++__C]='\n';
	}
	void file()
	{
		#ifdef NTFOrz
		freopen("a.in","r",stdin);
		#endif
	}
	inline void chktime()
	{
		#ifdef NTFOrz
		cerr<<clock()/1000.0<<'\n';
		#endif
	}
	#ifdef mod
	ll ksm(ll x,int y){ll ret=1;for (;y;y>>=1,x=x*x%mod) if (y&1) ret=ret*x%mod;return ret;}
	ll inv(ll x){return ksm(x,mod-2);}
	#else
	ll ksm(ll x,int y){ll ret=1;for (;y;y>>=1,x=x*x) if (y&1) ret=ret*x;return ret;}
	#endif
//	inline ll mul(ll a,ll b){ll d=(ll)(a*(double)b/mod+0.5);ll ret=a*b-d*mod;if (ret<0) ret+=mod;return ret;}
}
using namespace my_std;

int n,m; ll K;
struct hh{ll l,r;bool operator < (const hh &a) const {return l<a.l;}}a[sz],b[sz];
int opA[sz],opB[sz];
int idA[sz][2],idB[sz][2],cc;
vector<pii>V[sz<<2];
int dp[sz<<2];

// x 属于哪个线段；如果哪个都不属于就往前走 
int findA(ll x){int p=upper_bound(a+1,a+n+1,(hh){x,x})-a-1;if (p!=0&&a[p].r>=x) return p;return p+1;}
int findB(ll x){int p=upper_bound(b+1,b+m+1,(hh){x,x})-b-1;if (p!=0&&b[p].r>=x) return p;return p+1;}

int __CUR;
pll _tr[2][sz<<2];
#define tr _tr[__CUR]
#define ls k<<1
#define rs k<<1|1
#define lson ls,l,mid
#define rson rs,mid+1,r
void build(int k,int l,int r,hh *a)
{
	if (l==r) return tr[k]=MP(a[l].l-2ll*K*l,a[l].r-2ll*K*l),void();
	int mid=(l+r)>>1;
	build(lson,a),build(rson,a);
	tr[k]=MP(max(tr[ls].fir,tr[rs].fir),min(tr[ls].sec,tr[rs].sec));
}
int query(int k,int l,int r,int st,ll x)
{
	if (r<st) return -1;
	if (l==r) return x>=tr[k].fir&&x<=tr[k].sec?-1:l;
	int mid=(l+r)>>1;
	int res=query(lson,st,x);
	if (res!=-1) return res;
	return query(rson,st,x);
}

void work()
{
	__CUR=0; build(1,1,n+1,a);
	__CUR=1; build(1,1,m+1,b);
	auto GO=[](int i,int j,int l,int r,int del,int c,ll x)
	{
//		cerr<<l<<' '<<r<<'\n';
			rep(_,1,1) // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
			{
//				if (_>8)
//				{
//					cerr<<i<<' '<<j<<'\n';
//				}
				x+=K;
				if (b[r].l>x||b[r].r<x)
				{
					r=findB(x);
					if (b[r].l<x) c+=(r!=del),++r;
					V[idA[i][j]].push_back(MP(idB[r][opB[r]==l],c+1));
					break;
				}
				assert(r<=m);
				V[idA[i][j]].push_back(MP(idB[r+1][opB[r+1]==l],c+(r!=del)+1));
				c+=(r!=del); del=l;
				++l;
				x+=K;
				if (a[l].l>x||a[l].r<x)
				{
					l=findA(x);
					if (a[l].l<x) c+=(l!=del),++l;
					V[idA[i][j]].push_back(MP(idA[l][opA[l]==r],c+1));
					break;
				}
				assert(l<=n);
				V[idA[i][j]].push_back(MP(idA[l+1][opA[l+1]==r],c+(l!=del)+1));
				c+=(l!=del); del=r;
				++r;
			}
	};
	rep(i,1,n)
	{
		ll x=a[i].l;
		int t=findB(x+K);
		rep(j,0,1)
		{
			int l=i,r=t,del=(j?opA[i]:0),c=0;
			GO(i,j,l,r,del,c,x);
		}
		continue; // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
		__CUR=0; int af=query(1,1,n+1,i+1,x+2ll*K-2ll*(i+1)*K);
		__CUR=1; int bf=query(1,1,m+1,t,x+K-2ll*t*K);
		if (min(af-i-1,bf-t)<=6) continue;
		rep(j,0,1)
		{
			int l=i,r=t,del=(j?opA[i]:0),c=(del!=t);
			int k=min(af-i-1,bf-t)-3; l+=k,r+=k,c+=2*k-1,x+=2*k*K; del=r-1;
//			cerr<<l<<' '<<r<<'\n';
			GO(i,j,l,r,del,c,x);
		}
	}
}

void DP()
{
	static pii id[sz<<2]; int cc=0;
	rep(i,1,n+1) rep(j,0,1) id[++cc]=MP(a[i].l,idA[i][j]);
	rep(i,1,m+1) rep(j,0,1) id[++cc]=MP(b[i].l,idB[i][j]);
	sort(id+1,id+cc+1);
	static int pre[sz]; rep(i,1,cc) pre[id[i].sec]=i;
	memset(dp,~0x3f,sizeof(dp));
	dp[idA[1][0]]=1;
	rep(i,1,cc) for (auto p:V[id[i].sec]) chkmax(dp[p.fir],dp[id[i].sec]+p.sec);
}

int main()
{
	file();
	read(n,m,K);
	rep(i,1,n) read(a[i].l,a[i].r),--a[i].r;
	rep(i,1,m) read(b[i].l,b[i].r),--b[i].r;
	sort(a+1,a+n+1),sort(b+1,b+m+1);
	int added=0;
	if (a[1].l!=0) { added=1; ++n; drep(i,n,2) a[i]=a[i-1]; a[1]=hh{0,0}; }
	a[n+1]=b[m+1]=hh{int(2e9)+1,int(2e9)+1};
	rep(i,1,n+1) opA[i]=findB(a[i].l),opA[i]=((opA[i]!=-1&&b[opA[i]].l<=a[i].l)?opA[i]:m+i+1);
	rep(i,1,m+1) opB[i]=findA(b[i].l),opB[i]=((opB[i]!=-1&&a[opB[i]].l<=b[i].l)?opB[i]:n+i+1);
	rep(i,1,n+1) rep(j,0,1) idA[i][j]=++cc; rep(i,1,m+1) rep(j,0,1) idB[i][j]=++cc;
	
	// 无脑往前走 
	rep(i,1,n) rep(j,0,1) V[idA[i][j]].push_back(MP(idA[i+1][j&&opA[i]==opA[i+1]],1));
	rep(i,1,m) rep(j,0,1) V[idB[i][j]].push_back(MP(idB[i+1][j&&opB[i]==opB[i+1]],1));
	
	// 向对面跳
	work();
	{
		int _=max(n+1,m+1);
		rep(i,1,_) swap(a[i],b[i]),swap(opA[i],opB[i]);
		rep(i,1,_) rep(j,0,1) swap(idA[i][j],idB[i][j]);
		swap(n,m);
	}
	work();
	{
		int _=max(n+1,m+1);
		rep(i,1,_) swap(a[i],b[i]),swap(opA[i],opB[i]);
		rep(i,1,_) rep(j,0,1) swap(idA[i][j],idB[i][j]);
		swap(n,m);
	}
	
	DP();
	cout<<dp[idA[n+1][0]]-1-added;
	return 0;
}