import java.nio.channels.AsynchronousServerSocketChannel;
import java.util.*;

public class Main {
	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		long n = sc.nextLong();
		
		HashMap<Long, Integer> map = new HashMap<>();
		
		for(long i=2;i*i<=n;i++){
			while(n%i==0){
				n/=i;
				if(map.containsKey(i)){
					map.put(i, map.get(i)+1);
				}else{
					map.put(i,1);
				}
			}
		}
		long ans = 1;
		for(long l : map.keySet()){
			if(map.get(l)%2!=0) ans*=l;
		}
		System.out.println(ans);
	}
}