#include<stdio.h>

int main()
{
    int a[105],n,t,i,s,sum=0,count=0;
    scanf("%d %d",&n,&t);
    for(i=0;i<n;i++){
        scanf("%d",&a[i]);
        sum=sum+a[i];
    }
    s=sum/(4*t);
    for(i=0;i<n;i++){
        if(a[i]>=s)
            count++;
    }
    if(count>=t)printf("Yes");
    else printf("No");
    return 0;
}