#include<stdio.h>
int main()
{
	long long int x, a, y, b;
	scanf("%lld %lld %lld %lld", &x, &a, &y, &b);
	long long int c1, c2, i;
	for (i = 2; i * i <= y; i++)
	{
		if (y % i > 0)
			continue;
		for (c1 = 0; x % i == 0; c1 += a, x /= i);
		for (c2 = 0; y % i == 0; c2 += b, y /= i);
		if (c1 < c2)
		{
			printf("No\n");
			return 0;
		}
	}
	if (y > 1)
	{
		i = y;
		for (c1 = 0; x % i == 0; c1 += a, x /= i);
		for (c2 = 0; y % i == 0; c2 += b, y /= i);
		if (c1 < c2)
		{
			printf("No\n");
			return 0;
		}
	}
	printf("Yes\n");
	return 0;
}