#include <stdio.h>
#include <stdlib.h>
int i,n,m,a[101],sum,count;
double x;

int main()
{

    scanf("%d %d",&n ,&m);

    for(i=1;i<=n;i++){
        scanf("%d",& a[i]);
        sum=sum+a[i];
    }
     x=sum/(4.0*m);
        for(i=1;i<=n;i++){
        if(a[i]>=x){
            count++;
        }
    }
    if(count>=m)
    {
        printf("Yes\n");
    }
    else
    {
        printf("No\n");
    }



    return 0;
}

