#include<bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353;
using namespace std;
using ll=long long;
using ul=unsigned long long;
int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1};
int dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};
using Graph=vector<vector<int>>;
template<class T> T pow_mod(T A, T N, T M) {
	T res = 1 % M;
	A %= M;
	while (N) {
		if (N & 1) res = (res * A) % M;
		A = (A * A) % M;
		N >>= 1;
	}
	return res;
}

bool is_prime(long long N) {
	if (N <= 1) return false;
	if (N == 2 || N == 3) return true;
	if (N % 2 == 0) return false;
	vector<long long> A = {2, 325, 9375, 28178, 450775, 9780504, 1795265022};
	long long s = 0, d = N - 1;
	while (d % 2 == 0) {
		++s;
		d >>= 1;
	}
	for (auto a : A) {
		if (a % N == 0) return true;
		long long t, x = pow_mod<__int128_t>(a, d, N);
		if (x != 1) {
			for (t = 0; t < s; ++t) {
				if (x == N - 1) break;
				x = __int128_t(x) * x % N;
			}
			if (t == s) return false;
		}
	}
	return true;
}	
long long pollard(long long N) {
	if (N % 2 == 0) return 2;
	if (is_prime(N)) return N;
	long long step = 0;
	auto f = [&](long long x) -> long long {
		return (__int128_t(x) * x + step) % N;
	};
	while (true) {
		++step;
		long long x = 1, y = f(x);
		while (true) {
			long long p = gcd(y - x + N, N);
			if (p == 0 || p == N) break;
			if (p != 1) return p;
			x = f(x);
			y = f(f(y));
		}
	}
}
ll paw(ll a,ll b){
    ll t=a;
    ll ans=1;
    for(int i=0;i<b;i++)ans*=t;
    return ans;
}
vector<long long> prime_factorize(long long N) {
	if (N == 1) return {};
	long long p = pollard(N);
	if (p == N) return {p};
	vector<long long> left = prime_factorize(p);
	vector<long long> right = prime_factorize(N / p);
	left.insert(left.end(), right.begin(), right.end());
	sort(left.begin(), left.end());
	return left;
}
int main(){
    ll N;
    cin>>N;
    map<ll,ll>mp;
    vector<ll>T=prime_factorize(N);
    for(auto a:T)mp[a]++;
    ll c=1;
    for(auto[k,v]:mp)c*=(pow(k,v+1)-1)/(k-1);
    cout<<c<<endl;
}