#include<bits/stdc++.h>
using namespace std;
int main(){
int n,m,arr[105],i,count=0,sum=0;
 double a;
cin>>n;
cin>>m;
for(i=0;i<n;i++){
cin>>arr[i];}
for(i=0;i<n;i++){
sum=sum+arr[i];}
a=sum/(4.0*m);
for(i=0;i<n;i++){
if(arr[i]>=a){
count++;}}
if(count>=m){
cout<<"Yes"<<endl;}
else{
cout<<"No"<<endl;}}