import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        for(long i=2; i<X; i++){
            if( X%(i*i)==0 ){
                X=X/(i*i);
            }
        }
        System.out.println(X);
    }
}