#include <iostream>
#include <vector>
#include <queue>
using namespace std;
typedef long long ll;

int main()
{
    queue<int> Q;
    Q.push(1);
    Q.push(2);
    Q.push(3);

    cout << Q.front() << endl;
    cout << Q.size() << endl;
    cout << Q.empty() << endl;

    Q.pop();
    cout << Q.front() << endl;
    cout << Q.size() << endl;
    cout << Q.empty() << endl;

    return 0;
}