#include <stdio.h>

int main(){
	int i, j, n, m, sum=0, dummy;
	scanf("%d %d",&n,&m);
	int a[n];
	for(i=0;i<n;i++) {
      scanf("%d",&a[i]);
	 sum+=a[i];
    }
	for(i=0;i<n-1;i++){
		for(j=i+1;j<n;j++){
			if(a[i]<a[j]) {
				dummy = a[i];
				a[i] = a[j];
				a[j] = dummy;
			}
		}
	}
	if(4*m*a[m-1]<sum) puts("No");
	else puts("Yes");
}
