#include 
#include 
#include 
using namespace std;
typedef long long ll;

int main()
{
    queue 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;
}