#include <stdio.h>

inline int sqr(int a)
{
	return a * a;
}

bool solve(int l, int w, int r1, int r2)
{
	if (r1 * 2 > l || r1 * 2 > w || r2 * 2 > l || r2 * 2 > w)
		return false;
	int x1 = r1, y1 = r1, x2 = l - r2, y2 = w - r2;
	return sqr(x2 - x1) + sqr(y2 - y1) >= sqr(r1 + r2);
}

int main()
{
	int l, w, r1, r2;
	scanf("%d %d %d %d", &l, &w, &r1, &r2);
	printf("%s", solve(l, w, r1, r2) ? "YES" : "NO");
	return 0;
}