#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <math.h>
#include <cmath>
#include <stack>
#include <map>
#include <set>
#include <numeric>
#include <iomanip>
#include <climits>
#include <functional>
#include <cassert>
#include <tuple>
using namespace std;
using ll = long long;

int N;

int main() {

    cin >> N;
    int cnt = 0;
    for(ll i = 1; i*i <= N; ++i) {
        if(N%i == 0) {
            if(i*i == N) cnt++;
            else cnt += 2;
        }
    }

    cout << N-cnt << endl;

}