#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    int N,M,sum=0;
    cin>>N>>M;
    int A[N];
    for(int i=0;i<N;i++){
        cin>>A[i];
        sum+=A[i];
    }
    sort(A,A+N);
    cout<<(A[N-M]>=(double)sum/(4*M)?"Yes":"No")<<endl;
    return 0;
}