#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ll n;
    cin >> n;
    ll cnt = 0;
    for(ll i = 1; i * i <= n; i++){
        if(n % i == 0){
            cnt++;
            if(n / i != i) cnt++;
        }
    }
    cout << n - cnt << '\n';
}