import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		HashMap<Long, Integer> map = new HashMap<>();
		for (long i = 2; i <= Math.sqrt(x); i++) {
		    while (x % i == 0) {
		        if (map.containsKey(i)) {
		            map.put(i, map.get(i) + 1);
		        } else {
		            map.put(i, 1);
		        }
		        x /= i;
		    }
		}
		if (x != 1) {
	        if (map.containsKey(x)) {
	            map.put(x, map.get(x) + 1);
	        } else {
	            map.put(x, 1);
	        }
		}
		long ans = 1;
		for (Map.Entry<Long, Integer> entry : map.entrySet()) {
		    if (entry.getValue() % 2 == 1) {
		        ans *= entry.getKey();
		    }
		}
		System.out.println(ans);
	}
}