#include<queue>
#include<iostram>
using namespace std;
void main()
{
queue<int>q;
q.push(100);
q.push(200);
q.push(300);
cout<<"Number of elements in the queue : "<<q.size()<<endl;
cout<<q.front()<<endl;
q.pop();
cout<<q.front()<<endl;
q.pop();
cout<<"number of element currently in the queue "<<q.size()<<endl;
return(0);
}