#define _USE_MATH_DEFINES
 
#include <iostream>
#include <iomanip>
#include <sstream>
 
#include <algorithm>
#include <cmath>
 
#include <string>
//#include <array>
#include <list>
#include <queue>
#include <vector>
#include <complex>
#include <set>
#include <map>
 
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
 
#define PII pair<int,int>
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

LL yakuwa(LL N){
	LL ret = 0;
	LL temp = 1;
	LL m = 1;
	//1
	ret += 1;
	int count = 0;
	for(LL i = 2; i <= (LL)sqrt((LD)N); ++i){
		if( N%i == 0 ){
			++count;
			m = 1;
			temp = 1;
			while( N%i == 0 ){
				m *= i;
				N /= i;
				temp += m;
			}
			ret *= temp;
		}
	}
	if( N > 1 ){
		ret *= (1+N);
	}
	return ret;
}

int main(void){
    std::cin.tie(0); 
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    //cout << setprecision(16);//
	
	LL N;
	cin >> N;
	P( yakuwa(N%2?N:N/2) );
	return 0;
}