//https://ncode.syosetu.com/n4830bu/300/
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    ll X;
    cin >> X;
    ll maine = 1;
    for (ll i = 2; i * i <= X; i++) {
        int cnt = 0;
        while (X % i == 0) {
            cnt++;
            X /= i;
        }
        if (cnt % 2 == 1)
            maine *= i;
    }
    maine *= X;
    cout << maine << endl;
}