#include<stdio.h>
int main(){
    int n,m,i;
    int a[100];
    int count = 0;
    int sum = 0;
    
    scanf("%d %d",&n,&m);
    for(i = 0; i < n; i++) scanf("%d",&a[i]);
    for(i = 0; i < n; i++) sum += a[i];
    
    int border = 4 * m;
    double min = sum / border;
    min += 0.5;
    min *= 10;
    min = (int)min/10;
    
    for(i = 0; i < n; i++){
        if(a[i] >= min) count++;
    }
//    printf("min is %f\n",min);
    if(count >= m) printf("Yes\n");
    else printf("No\n");
    return 0;
}
