import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        long Y = 1L;
        int c=0;
        while(X%2==0){
            X/=2;
            c++;
        }
        if(c%2==1){
            Y*=2;
        }
        long A = (long)Math.sqrt(X);
        for(long i=3; i<=A; i+=2){
            c=0;
            while(X%i==0){
                X/=i;
                c++;
            }
            if(c%2==1){
                Y*=i;
            }
        }
        Y*=X;
        System.out.println(Y);
    }
}