public class Main{
	public static void main(String arg[]){
		Queue q = new Queue(5);

		q.push(5);
		q.push(4);
		q.push(3);
		q.push(2);
		q.push(1);

		System.out.println(q.pop());
		System.out.println(q.pop());
		System.out.println(q.pop());
		System.out.println(q.pop());
		System.out.println(q.pop());
	}
}

class Queue{
	int size;
	int it ;
	int poping_it;
	int array[] ;
	public Queue(int n){
		size = n;
		it = -1 ;
		poping_it = -1 ;
		array = new int[size];
	}
	public void push(int n){
		array[++it] = n ;
	}
	public int pop(){
		return array[++poping_it];
	}
}