#include <stdio.h>

#define N 100

int main(void) {
    int n, m;
    int a[N] = {-1};
    scanf("%d %d", &n, &m);
    int i, vote = 0, count = 0;

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

    for (i=0; i<n; i++) {
        if (a[i]*4*m >= vote) count += 1;
    }

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

    return 0;
}