#include <bits/stdc++.h>
using namespace std;
int main(){
    int N, M;
    int count = 0;
    cin >> N >> M;
    vector<int> A(N);
    for(int i; i < N; i++){
        cin >> A[i];
    }

    sort(A.begin(), A.end());
    reverse(A.begin(), A.end());

    if(A[M-1] > double(1/(4*M))){
        cout << 'Yes' << endl;
    }
    else{
        cout << 'No' << endl;
    }
}