#include<stdio.h>
long long int a[200005];
int main()
{
	long long int n, x, m;
	scanf("%lld %lld %lld", &n, &x, &m);
	long long int i, j;
	for (i = 0; i < n; i++)
		scanf("%lld", &a[i]);
	long long int c = 0;
	for (i = n - 1; i >= 0; i--)
	{
		for (j = 0; j < c; j++)
			a[i] /= 2;
		while (a[i] >= x)
		{
			m -= i + 1;
			c++;
			a[i] /= 2;
		}
	}
	if (m < 0)
		printf("No\n");
	else
		printf("Yes\n");
	return 0;
}