import java.util.*;
public class Sqrt{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		long X = scan.nextLong();
                System.out.println(makeAns(X));
	}

	public static long makeAns(long number){
		long res = number;
		long answer = 1;
		for(long i = 2; i*i <= res; i++){
			int count = 0;
			while(res%i == 0){
				res /= i;
				count++;
			}

			if(count%2 != 0)answer *= i;
		}

		if(res > 1){
			answer *= res;
		}

		return answer;
	}
}