#include <bits/stdc++.h>

inline void Solve() {
	int n;
	std::cin >> n;
	std::vector<std::pair<int, int>> A(n + 5);

	int a, b, c, d;
	std::cin >> a >> b >> c;
	for (int i = 1; i <= n; i++) {
		std::cin >> A[i].first >> A[i].second;
	}
	std::cin >> d;
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		auto [x, y] = A[i];
		bool win = x + y < c;
		x = std::min(a, x + d);
		win &= x + y >= c;
		ans += win; 
	}
	
	std::cout << ans << '\n';
	return;
}

int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(nullptr);

	int T = 1;
	while (T--) {
		Solve();
	}
	return 0;
}