import java.util.ArrayList;
import java.util.Scanner;

public class Main299 {
    public static void main(String[] args) {
        new Main299();
    }

    public Main299() {
        Scanner sc = new Scanner(System.in);
        long x = sc.nextLong();
        System.out.println(solve(x));
    }

    public long solve(long x) {
        long res = 1;
        for (long i = 2; i * i < (10e+12) + 1; i++) {
            int count = 0;
            while (x % i == 0) {
                x /= i;
                count++;
            }

            res *= count % 2 == 1 ? i : 1;
        }

        return res * x;

    }
}