// Inbuilt_Queue
#include <iostream>
#include <queue>
using namespace std;


int main()
{
	queue<int> q;
	q.push(0);
	q.push(1);
	q.push(2);
	q.push(3);
	q.push(4);

	while(!q.empty()){
		cout<<q.front()<<endl;
		q.pop();
	}

	return 0;
}