POJ 1183

#include<iostream>
#include<stdio.h>
using namespace std;

int main()
{
    //freopen("acm.acm","r",stdin);
    unsigned long a;
    unsigned long m;
    unsigned long n;
    unsigned long tem;
    cin>>a;
    tem = a*a + 1;
    for(m = a; m>=1 ; -- m)
    {
        if((a*a + 1)%m == 0)
            break;
    }
    n = tem/m;
    cout<<m+n+2*a<<endl;
}

 

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