#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,count=0;
	float m,sum=0;
	cin>>n>>m;
	int a[n];
		for(int i=0;i<n;i++){
			cin>>a[i];
			sum+=a[i];
	}
	sum=sum/(4*m);
		for(int i=0;i<n;i++){
			if(a[i]>=sum){
			count++;
			}
		}
	if(count>=m) cout<<"Yes";
	else cout<<"No";
	return 0;
}