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

int main() {
	int N;
	cin >> N;
	int count=0;
	for(int i=1;i*i<=N;i++){
		if(N%i==0){
			count++;
			if(i*i!=N) count++;
		}
	}
	cout << N-count << endl;
}