#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;
    q.pop();

    cout << q.front() << endl;
    q.pop();

    cout << q.front() << endl;

    return 0;
}