#include <queue>

#include <cstdlib>

using namespace std;

int main(){

queue<int> que;

que.push(1);

que.push(2);

que.push(3);

printf("%d\n", que.front());

que.pop();

printf("%d\n", que.front());

que.pop();

printf("%d\n", que.front());

system("pause");

return 0;

}