#include<stdio.h>
int main()
{
	int N,M,a,X;
	int sum=0;
	scanf("%d %d\n",&N,&M);
	for (a = 1; a <= N; a++) {

		int sum = sum+X;
	}
	for (a = 1; a <= N; a++) {
		scanf("%d ",&X);
		if (4*X*M < sum)
		{
			printf("No");

		}
		if (4 * X * M < sum)break;
	}
	if (a=N+1)
	{
		printf("Yes");
	}
}