import java.util.Arrays;
import java.util.Scanner;

public class Yukicoder300 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int cnt;
        long x = sc.nextLong(), y = 1;
        int num = 20000000;
        boolean[] p = new boolean[num];
        Arrays.fill(p, true);
        for (int i = 2; i < num; i++) {
            if (p[i]) {
                for (int j = 1; j * i < num; j++) {
                    p[j * i] = false;
                }
                cnt = 0;
                while (x % i == 0) {
                    x /= i;
                    cnt++;
                }
                if (cnt % 2 == 1)
                    y *= i;
                if (x == 1)
                    break;

            }
        }
        System.out.println(y);
    }
}