#include <bits/stdc++.h>
using namespace std;
//#include <atcoder/all>
//using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define MAX 200003
#define MOD 1000000007
#define INF 1000000000000000000

int main(){
  ll N;
  cin>>N;

  for(ll i=2;i*i<=N;i++){
    ll d=N%i;
    ll n=N;
    bool flag=true;
    while(n>0){
      if(n%i!=d){
        flag=false;
        break;
      }
      n/=i;
    }
    if(flag==true){
      cout<<i<<endl;
      return 0;
    }
  }

  //N=ans*d+d
  for(ll i=1000000;i>0;i--){
    if((N-i)%i!=0){
      continue;
    }
    ll ans=(N-i)/i;
    if(ans<i){
      continue;
    }
    cout<<ans<<endl;
    return 0;
  }
}