import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.lang.*;
import java.math.BigDecimal;
import java.text.NumberFormat;
import java.text.DecimalFormat;

/**
 * Sample for NumberFormat.
 */
class NumberFormatSample {

  /**
   * Do it.
   */
  public void doIt() {
    NumberFormat form = new DecimalFormat("##,###");

    BufferedReader ins = new BufferedReader(new InputStreamReader(System.in));
    String line;
    while ((line = ins.readLine()) != null) {
      BigDecimal x = new BigDecimal(line);
      System.out.println("x = " + form.format(x));
    }
    return;
  }

  public static void main(String args[]) throws IOException {
    NumberFormatSample sample = new NumberFormatSample();
    sample.doIt();
  }
}