#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,a,b) for(int i=a;i<b;i++)
using vi = vector<int>; 
using vvi = vector<vi>; 
using li =vector<ll>;
using lli=vector<li>;
using si =vector<char>;
using ssi =vector<si>;
//using mint = modint998244353;
const long long INF = 1e18;
const long long MOD=1e9+7;
//bit全探索 rep(i,0,1<<(n-1)){rep(j,0,n-1)if(I&(1<<j))}
//int a = s[0] - ‘0’;文字列から数字
//int a=atoi(s.c_str());
//“ABCDEFGHIJKLMNOPQRSTUVWXYZ"
//printf("%.9f\n", ans);
//printf("%.20llf\n",solve(N));
int main() { ll n;cin>>n;
ll N=n;
vector<pair<int,int>>P;
for(ll i=2;i*i<=n;i++){
	if(n%i==0){
		ll cnt=0;
		while(n%i==0){cnt++;n/=i;}
		P.push_back({i,cnt});
	}
}
if(n>1)P.push_back({n,1});
ll cnt=1;
for(auto b:P){
cnt*=(b.second+1);	
}
cout<<N-cnt;
}