public class DistanceTraveledPerDay {
  public static void main(String[] args){
    long speed = (300000L * 60L); /* 分速*/
    int day = (24 * 60); /* 分 */
    System.out.println(speed + " × " + day + " = " + (speed * day) + "(m)" + " = " + ((speed * day) / 60 ) + "(km)") ; /* long型が優先される */
  }
}