#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>
#include <sstream>
#include <map>
#include <queue>
#include <stack>

using namespace std;

long long calc(long long x){
    long long res=1;
    for(long long i=2;i*i<=x;i++){
        long long tmp=i;
        while(x%i==0){
            x/=i; tmp*=i;
        }

        //(1+i^1+i^2+...+i^(n-1))=(i^n)/(i-1)
        //tmp=i^n
        res*=(tmp-1)/(i-1);
    }
    
    //残ったxは素数
    if(x!=1){
        res*=(1+x);
    }
    
    return res;
}

int main()
{

    long long n;
    cin>>n;
    
    long long x;
    if(n%2) x=n;
    else x=n/2;

    cout<<calc(x)<<endl;

    return 0;
}