#include <stdio.h>

int main(void)
{
    int i, M, N, A[i], sum = 0, a = 0;
    if (scanf("%d %d", &N, &M) == 2)
    for (i = 0; i < N; i++)
    {
        if (scanf("%d", &A[i]) == 1)
        sum = sum + A[i];
    }
    for (i = 0; i < N; i++)
    {
        if (4 * A[i] * M >= sum)
        {
            a++;
        }
    }
    if (a >= M)
    {
        printf("Yes\n");
    }
    else
    {
        printf("No\n");
    }

    return 0;
}