#include <iostream>

using namespace std;

class Stack
{
private:
    int * Arr;
    int TOP, SIZE;
public:
    Stack(unsigned int _size = 15)
    {
        Arr = new int[15];
        SIZE = _size;
        TOP = 0 ;
    }
    bool Push(int value)
    {
        if (TOP<SIZE)
        {
            Arr[TOP++]= value;
            return true;
        } else
            return false;

    }

    bool pop(int & val)
    {
        if (TOP-1 >= 0)
        {
            val = Arr[TOP--];
            return true;
        } else
                return false;
    }
};

int main()
{
    Stack T;
    for (int i =0 ; i < 15; i++)
    {
        if (T.Push(i))
            cout << i << endl;
        else
            cout << "No" << endl;
    }
    return 0;
}