#include<bits/stdc++.h>
using namespace std;
int a[103];
bool cmp(int a,int b){
	return a>b;
}
int main(){
	int m,n;
	int sum=0;
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++){
		scanf("%d",&a[i]);
		sum+=a[i];
	}
	sort(a+1,a+1+n,cmp);
	if(a[m]>=(1.0*sum/(4*m)))printf("Yes\n");
	else printf("No\n");
}