#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    llong x;
    cin >> x;

    int limit = (int)sqrt(x) + 1;
    llong result = 1;
    for(int i=2; i<=limit; i++) {
        bool flg = false;
        while(x % i == 0) {
            x /= i;
            flg = !flg;
        }
        if(flg) result *= i;
    }

    cout << result * x << "\n";
}