#include <bits/stdc++.h>
using namespace std;
const long long mod = 998244353;
const long long N = 2e5;
const long long inf = 1e18;
template <typename... T>
void read(T&... args) {
  ((cin >> args), ...);
}
template <typename... T>
void write(T&&... args) {
  ((cout << args << " "), ...);
}
template <typename... T>
void writeline(T&&... args) {
  ((cout << args << " "), ...);
  cout << "\n";
}
long long add(long long a, long long b) {
  long long res = (a + b) % mod;
  return (res < 0) ? res + mod : res;
}
long long mul(long long a, long long b) {
  long long res = (a * 1LL * b) % mod;
  return (res < 0) ? res + mod : res;
}
string binary(long long x) {
  string res = "";
  for (long long i = 0; i < 32; i++) res += (1 << i & x) ? '1' : '0';
  return res;
}
long long in(long long x, long long y, long long z) {
  if (y > z) swap(y, z);
  return (x >= y && x <= z);
}
void solve() {
  long long n;
  read(n);
  vector<long long> fac;
  for (long long i = 2; i * i <= n; i++) {
    if (n % i == 0) {
      fac.push_back(i);
      while (n % i == 0) n /= i;
    }
  }
  long long ans = 0;
  if (n > 1) fac.push_back(n);
  if (fac.size() == 1)
    ans = fac[0];
  else
    ans = 1;
  cout << ans;
}
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  solve();
  return 0;
}
