/*
 * Stack class (Integers only)
 * written by Arthur Gapusan (ajgapusan@hotmail.com)
 * http://www.planet-java.biz.ly
 *
 */


class Stack {
  int stck[];
  int tos;

  Stack(int size) {
    stck = new int[size];
    tos = - 1;
  }

  void push(int item) {
    if (tos==stck.length-1);
    else
      stck[++tos] = item;
  }

  int pop() {
    if (tos < 0) 
      return 0;
    else
      return stck[tos--];
  }
}