#include<stdio.h>

int main(){
    int n,m,i;
    scanf("%d %d",&n,&m);
    int a[1001],all=0,count=0;
    for(i=0;i<n;i++){
        scanf("%d",&a[i]);
        all+=a[i];
    }
    for(i=0;i<n;i++){
        if(a[i]*4*m>=all){
            count++;
        }
    }
    if(count>=m)
        printf("Yes");
    else
        printf("No");
}