#include <iostream>
using namespace std;

bool isPrime(long long x){
   if(x <= 1) return false;
   if(x == 2) return true;
   if(!(x % 2)) return false;
   for(long long i = 3;i * i < x;i += 2) if(!(x % i)) return false;
   return true;
}

int main(){
   long long n;
   cin >> n;
   int i = n & 1 ? 3 : 4;
   if(n % 2 == 0) n /= 2;
   if(n % 2 == 0) n /= 2;
   if(isPrime(n)){
      cout << n << endl;
      return 0;
   }
   for(;i * i < n;i += 2){
      if(n % i == 0){
         cout << i << endl;
         return 0;
      }
   }
}