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

int main(){

    queue<int> q;
    if (q.empty()){
        cout << "Queue is empty " << endl;
    }
    q.push(100);
    if (!q.empty()){
        cout << "Queue is not empty. Front element: " << q.front() << endl;
    }
    return 0;
}