#include <stdio.h>

int main(void){
    int n, m, i, s[100], sum = 0, cnt = 0;
    scanf("%d %d", &n, &n);
    for( i = 0; i < n; i++){
        scanf("%d", &s[i]);
        sum = + s[i];
    }
    for( i = 0; i < n; i++){
       if( sum < 4 * m * s[i] )
        cnt++;
    }
    if( cnt == m )
        printf("Yes\n");
    else
        printf("No\n");
    return 0;
}
