#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

signed main(){
  ll X; cin >> X;
  ll Y = 1LL;
  ll x = X;
  for( int i = 2; 1LL * i * i <= X; ++i ){
    if( x % i == 0 ){
      int cnt = 0;
      while( x and x % i == 0 )
        ++cnt, x /= i;
      if( cnt & 1 )
        Y *= i; 
    }
    if( x % i == 0 ){
      int cnt = 0;
      while( x and x % ( X / i ) == 0 )
        ++cnt, x /= X / i;
      if( cnt & 1 )
        Y *= i;
    }
  }
  cout << Y * x << endl;
  return 0;
}