#include <iostream>
using namespace std;
long long int n, i = 2, S = 0;
int main() {
cin >> n;
while (n % i != 0) i++;
n = n / i;
S = S + i;
i = 2;
while (n % i != 0) i++;
n = n / i;
S = S + i + n ;
cout << S;
return 0;
}
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