#include <bits/stdc++.h>

using std::cin;
using std::cout;
using std::vector;
using P = std::pair<int, int>;

vector<P> factorize(int n) {
	vector<P> res;
	for (int i = 2; i * i <= n; ++i) {
		if (n % i) continue;
		res.emplace_back(i, 0);
		while (n%i == 0) {
			n /= i;
			res.back().second++;
		}
	}
	if (n != 1) res.emplace_back(n, 1);
	return res;
}

int main() {
	int n;
	cin >> n;
	
	auto f = factorize(n);
	int ans = 0;
	for (auto [x, y] : f) {
		ans += x*y;
	}
	
	cout << ans << '\n';
	
	return 0;
}