#include<stdio.h>
int main()
{
    long long int n,m,a[1005];
    long long int i,number=0;
    double average=0;
    scanf("%lld %lld",&n,&m);
    for(i=0;i<n;i++)
    {
        scanf("%lld",&a[i]);
        average+=a[i];
    }
    average=average*1.0/(4*m);
    for(i=0;i<n;i++)
    {
        if(a[i]>=average)
            number++;
        if(number>=m)
            break;
    }
    if(number>=m)
        printf("Yes");
    else printf("No");
    return 0;
}