#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using i64=long long;
using u64=unsigned long long;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    int a,b,c;
    cin>>a>>b>>c;
    vector<int> x(n+1),y(n+1);
    for(int i=1;i<=n;i++) cin>>x[i]>>y[i];
    int d;
    cin>>d;
    int ans=0;
    for(int i=1;i<=n;i++){
        x[i]+=d;
        if(x[i]>=a) x[i]=a;
        if(x[i]+y[i]>=c) ans++;
    }
    cout<<ans;
    return 0;
}