#include <stdio.h>

int main()
{
    int n,m,a[100],i,j,sum = 0;

    scanf("%d %d",&n,&m);
    for (i = 0; i < n; i++)
    {
        scanf("%d",&a[i]);
        sum += a[i];
    }
    int ans = 0;
    for (i = 0; i < n; i++)
    {
        if(a[i] * 4 * m >= sum)
        {
            ans++;
        }
    }

    if(m <= ans)printf("Yes");
    else printf("No");
}