#include<stdio.h>
#define N 110
int main(){
    int a[N],n,m,i,cnt=0,num=0;
    double min;
    scanf("%d%d",&n,&m);
    for(i=0;i<n;i++){
        scanf("%d",&a[i]);
        num+=a[i];
    }
    min=num/(4.0*m);
    for(i=0;i<n;i++){
        if(a[i]>=min) cnt+=1;
    }
    if(cnt>=m) printf("Yes");
    else printf("No");
    return 0;
}
