#include 
#include 
using namespace std;

int main() {
    queue Q;
    int a = 5;
    Q.push(1);
    Q.push(2);
    Q.push(3);
    Q.push(a);
    
    while(Q.size() > 0) {
        cout << Q.front() << endl;
        Q.pop();
    }

    return 0;
}