public class Pair {
  int first;
  int second;

  Pair() {
    first = 0;
    second = 0;
  }

  Pair(int first) {
    this.first = first;
  }

  Pair(int first, int second) {
    this.first = first;
    this.second = second;
  }

  public void set_first(int first) {
    this.first = first;
  }

  public void set_second(int second) {
    this.second = second;
  }

  public int get_first() {
    return first;
  }

  public int get_second() {
    return second;
  }
}