#include <bits/stdc++.h>
using namespace std;

int main(){
    long int N,M;
    cin>>N>>M;
    long int A[N],sum=0;
    for (long int i=0;i<N;i++){
        cin>>A[i];
        sum+=A[i];
    }
    sort(A,A+N);
    if (4*M*A[N-M]<sum) cout<<"No"<<endl;
    else cout<<"Yes"<<endl;
    return 0;
}
