#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>
#include <sstream>
#include <map>
#include <queue>
#include <stack>

using namespace std;

__int128 gcd(__int128 x,__int128 y){
    return y==0 ? x : gcd(y,x%y);
}

const int N=10000000;
vector<long long > prime;
bool is_prime[10000000+1];

void era(){
    for(int i=0;i<N+1;i++) is_prime[i]=true;
    is_prime[0]=is_prime[1]=false;
    for(int i=2;i<=N;i++){
        if(is_prime[i]){
            prime.push_back(i);
            for(int j=2*i;j<=N;j+=i) is_prime[j]=false;
        }
    }
}

long long my_pow(long long x,long long n){
    long long res=1;
    while(n){
        if(n&1) res*=x;
        x=x*x;
        n>>=1;
    }
    return res;
}

bool check(long long x){

    for(int i=0;prime[i]*prime[i]<=x;i++){
        if(x%prime[i]==0) return false;
    }
    return true;
}

int main()
{
    era();

    long long n;
    cin>>n;
    
    __int128 n128=n;
    __int128 x128=gcd(n128,(1+n128)*n128/2);
    long long x=x128;
    
    if(x!=1 && check(x)){
        cout<<1+x<<endl;
        return 0;
    }
    
    long long res=1;
    for(int i=0;i<prime.size();i++){
        long long cnt=1;
        while(x%prime[i]==0){
            x/=prime[i]; cnt++;
        }
        if(cnt!=1) cout<<prime[i]<<endl;
        res*=(1-my_pow(prime[i],cnt))/(1-prime[i]);
        
    }
    cout<<res<<endl;

    return 0;
}