#include <bits/stdc++.h>
#define ll long long
using namespace std;
#define rep(i, n) for (int i = 0; i < n; i++)
#define rrep(i, n) for (int i = 1; i <= n; i++)
ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
ll lcm(ll a, ll b) { return (a * b) / gcd(a,b); }
using P = pair <int, int>;
 
ll MOD = 1000000007;
ll INF =1<<29;

int main() {
     int n;
     cin >>n;
     int MI = INF;
     int m=n;
     for(int i = 2;i*i<=n;++i){
         while(m>=1&&m%(i*i)==0){
             m/=(i*i);
         }
     }
     cout << m << endl;
}