import java.util.*;
public class Stack2{
    private int[] stack;
    private int size;

    public Stack2(){
        stack = new int[10];
        size = 0;
    }

    public Stack2(int height){
        if(height <= 0){
            throw new EmptyStackException();
        }
        stack = new int[height];
        size = 0;
    }

    public void add(int value){
        if (size == stack.length){
            throw new StackOverflowException();
        }
        stack[size] = value;
        size++;
    }


    public int pop(){
        if(size == 0){
            throw new EmptyStackException();
        }
        size--;
        return stack[size + 1];
    }

    public int peek(){
        if(size == 0){
            throw new EmptyStackException();
        }
        return stack[size - 1];
    }

    public boolean isEmpty(){
        if(size == 0){
            return true;
        }
        return false;
    }

    public int getSize(){
        return this.size;
    }

    class StackOverflowException extends RuntimeException{
        public StackOverflowException(){
            super("Nothing can be added to the stack. The stack was full and has overflowed");
        }

        public StackOverflowException(String message){
            super(message);
        }
    }
}