#include <stdio.h>
#include <string.h>

int main(void){
    int n,m,a[10000],b=0;
    scanf("%d%d",&n,&m);
    for (int i=1;i<=n;i++){
        scanf("%d",&a[i]);
        b += a[i];
    }
    for (int j=1;j<=n-1;j++){
        for (int k=j+1;k<=n;k++){
            if (a[j] < a[k]){
                long long tmp = a[j];
                a[j] = a[k];
                a[k] = tmp;
            }
        }
    }
    if (a[m] >= b/(4*m)){
        printf("Yes");
    }else{
        printf("No");
    }
    return 0;
}
