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;

    long[] factor = new long[10];
    int[] count = new int[10];

    int index = 0;

    while(n != 1 && n % 2 == 0){
      if(n % 2 == 0){
        factor[index] = 2;
        while (n % 2 == 0){
          count[index]++;
          n /= 2;
        }
        index++;
      }
    }


    for (long i = 3; i * i <= n; i += 2){
      if (n % i == 0){
        factor[index] = i;
        while(n % i == 0){
          count[index]++;
          n /= i;
        }
        index++;
      }
    }


    if (index == 0){
      System.out.println(nd);
      return;
    }

    long answer = 1;
    for (int i = 0; i < index; i ++){
      if(count[i] % 2 == 1){
        answer *= factor[i];
      }
    }
    System.out.println(answer * n);
  }
}