import java.util.*;
import java.io.*;

public class Exercise68{
  public static void main (String[] args) throws IOException{

    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String nStr = new String(in.readLine());

    long nd = Long.parseLong(nStr);
    long n = nd;

    HashMap<Long,Integer> factor = new HashMap<Long,Integer>();

    while(n != 1 && n % 2 == 0){
      if(factor.containsKey(2)){
        factor.put((long)2, factor.get(2) + 1);
      }else{
        factor.put((long)2, 1);
      }
      n /= 2;
    }


    for (long i = 3; i * i <= n; i += 2){
      while(n % i == 0){
        if(factor.containsKey(i)){
          factor.put(i, factor.get(i) + 1);
        }else{
          factor.put(i, 1);
        }
        n /= i;
      }
    }

    if (factor.size() == 0){
      System.out.println(nd);
      return;
    }
    long answer = 1;
    for (Map.Entry<Long,Integer> entry : factor.entrySet()){
      if(entry.getValue() % 2 == 1){
        answer *= entry.getKey();
      }
    }
    System.out.println(answer * n);
  }
}