import java.util.Scanner;

public class No300 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long y = 1;
		int cnt = 0;
		
		for(long i = 2;i * i <= x;i++) {
			while(x % i == 0) {
				x /= i;
				cnt++;
			}
			if(cnt % 2 != 0) {
				y *= i;
			}
			cnt = 0;
			if(x == 1) {
				break;
			}
		}
		if(x != 1) {
			System.out.println(x);
		}else {
			System.out.println(y);
		}
	}
}