#include <stdio.h>
int main(void){
    int N, M, G = 0;
    scanf("%d", &N); scanf("%d", &M);
    int A[N];
    for(int i = 0; i < N; i++){
        scanf("%d", &A[i]);
        G += A[i];
    };
    int s = 0, X, q;
    q = 4 * M;
    X = G / q;
    for(int j = 0; j < N; j++){
        if(A[j] >= X){
            s +=1;
        };
    };
    if(s >= M) printf("yes\n");
    else printf("no\n");
    return 0;
}