class CustomStack {

  Stack<Integer> stack;
  Stack<Integer> temp = new Stack<>();
  int count;
  int maxSize;

  public CustomStack(int maxSize) {
    stack = new Stack<>();
    this.maxSize = maxSize;
  }

  public void push(int x) {
    if (count < maxSize) {
      stack.push(x);
      count++;
    }
  }

  public int pop() {
    if (stack.empty()) {
      return -1;
    }
    count--;
    return stack.pop();
  }

  public void increment(int k, int val) {
    while (count > k) {
      temp.push(stack.pop());
      count--;
    }
    while (count > 0) {
      temp.push(stack.pop() + val);
      count--;
    }
    while (!temp.empty()) {
      count++;
      stack.push(temp.pop());
    }
  }
}