#include <bits/stdc++.h>   using namespace std;   long long n, fir;   int main() {     scanf( %lld , &n);     fir = n;     for (int i = 2; 1ll * i * i <= n; i++)       if (n % i == 0) {         fir = i;         break;       }     for (; n != 1 && n % fir == 0; n /= fir)       ;     printf( %lld n , n == 1 ? fir : 1);   }   