#include<iostream>
using namespace std;
int main(){
    int s,maxn=INT_MAX;
    cin>>s;
    for(int i=1;i<=s;i++){
        if(s/(i*1.0000)==s/i&&(i+s/i)*2<=maxn){
            maxn=(i+s/i)*2;
        }
    }
    cout<<maxn;
    return 0;
}