#include<stdio.h>
int main(void)
{
    double a[101],n,sum = 0;
    double m;
    int count = 0,i;
    scanf("%lf %lf",&n,&m);
    for(i = 1 ; i <= n ; i++)
    {
        scanf("%lf",&a[i]);
        sum+= a[i];
    }
    for(i = 1 ; i <= n ; i++)
    {
        if((a[i] / sum) >= 1 / (4 * m) )
        {
            count++;
        }
    }
    if(count >= m)
    {
        printf("Yes");
    }
    else
    {
        printf("No");
    }
    
    return 0 ;
}