#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int long long

void solve(){
	int n;
	cin >> n;
	int a,b,c;
	cin >> a >> b >> c;
	int cnt = 0;
	vector<int> x(n),y(n);
	for (int i = 0;i<n;i++){
		cin >> x[i] >> y[i];
	}
	int d;
	cin >> d;
	for (int i = 0;i<n;i++){
		if (x[i] + y[i] >=c){
			continue;
		}
		y[i] += d;
		if (y[i] > b){
			y[i] = b;
		}
		if (x[i] + y[i] >= c){
			cnt++;
		}
	}
	cout << cnt;
    return;
}

signed main(){
    // freopen("input.txt","r",stdin);
    ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    int _ = 1;
    while (_--){
        solve();
    }
    return 0;
}