#include <iostream>
using namespace std;

class MoreData {
    int * __data;
    int head, tail, capacity;
public:
    MoreData(int cap) {
        capacity = cap;
        __data = new int[capacity];
        head = tail = 0;
    }
    MoreData & push(int val) {
        __data[tail++] = val;
        return *this;
    }
    int pop() {
        return __data[head++];
    }
    int size() {
        return tail - head;
    }
};
int main() {
    auto myData = MoreData(100);
    myData.push(1);
    myData.push(2);
    myData.push(3);
    myData.push(11).push(12).push(13);
    cout << myData.pop() << endl;
    return 0;
}