#include <stdio.h>

int main(void)
{
    int n, m, i;
    int sum = 0, count = 0;

    int a[1000];

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

    for (i = 0; i < n; i++)
    {
        scanf("%d", &a[i]);
        sum += a[i];
    }

    for (i = 0; i < n; i++)
    {
        if (a[i] * 4 * m >= sum) count++;
    }

    if (count >= m) printf("Yes");
    else printf("No");

    return 0;
}
