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 n = Long.parseLong(nStr);

    long sq = (long)Math.sqrt((double)n);

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

    long answer = 1;

    for(long i = 2; i <= sq; i++){
      int count = 0;
      while (n % i == 0){
        n /= i;
        count++;
      }
      if(count > 0){
        factor.put(i, count);
      }
    }

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