/* File: Roll.java - March 2017 */
package l10;
/**
* A command line utility to get a random integer 0 to n-1
*
* @author Michael Albert
*/

import java.util.Random;

public class Roll{

  public static void main(String[] args) {
    int n = Integer.parseInt(args[0]);
    System.out.println((int) (Math.random()*n)  );
  }
}