import java.util.Scanner;

public class No300 {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		long input = scanner.nextLong();
		System.out.println(getAnswerNum(input));
		scanner.close();
	}

	private static long getAnswerNum(long input) {
		long index = 2;
		while(true) {
			long squareIndex = index * index;
			if(input < squareIndex) {
				break;
			}
			while(input % squareIndex == 0) {
				input /= squareIndex;
			}
			index++;
		}
		return input;
	}
}