#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

int main(){
  ll x; cin >> x;
  ll y = 1;
  for(ll p = 2; p * p <= x + 1; p++){
    if(x % p != 0) continue;
    int cnt = 0;
    while(x % p == 0){
      x /= p;
      cnt++;
    }
    if(cnt % 2 == 1) y *= p;
  }
  if(x > 0) y *= x;
  printf("%lld\n", y);
  return 0;
}