int Leapyear;
    Leapyear = IsLeapYear(y);
   else if (Leapyear == 1)

#include <iostream>;
#include <iomanip>;
 
using std::cin;
using std::cout;
using std::endl;
using std::setw;
 
int First_Day_Of_Month(int y, int m);
int Number_Days_Of_Month(int y, int m);
bool IsLeapYear(int y);
void Print_Version();
void Print_Head(int y);
void Print_Month(int y, int m);
void Print_Month_Head(int m);
 
 
void main ()
{
    Print_Version();
        int year;
        cin >> year;
 
    Print_Head(year);
    for(int i=1; i<=12; i++){
        Print_Month(year, i);
    }
    cout << "\nGoodbye! \n";
}
 
 
//Functions
 
void Print_Version()
{
    cout << "Please Enter any Year After 1799 \n";
}
 
void Print_Head(int y)
{
    cout << "                         " << y << endl;
    cout << "==================================================\n";
}
 
void Print_Month(int y, int m)
{
    Print_Month_Head(m);
    int firstday, number_days;
    firstday = First_Day_Of_Month(y,m);
    number_days = Number_Days_Of_Month(y,m);
    cout << "            ";
    for (int k=0; k<firstday; k++)
        cout << "     ";
    for (int i = 1; i<=number_days; i++){
        cout << setw(5) << i;
        if ((i + firstday)%7 == 0){
            cout << endl;
            cout << "            ";
        }
    }
}
 
bool IsLeapYear(int y) 
{
    if (y%400 == 0)
    {
        return 1;
    }
    else if (y%4 == 0 && y%100 != 0)
    {
        return 1;
    }
    else
        return 0;
}
 
int First_Day_Of_Month(int y, int m)
{
    return 2;
}
 
int Number_Days_Of_Month(int y, int m)
{
    int Leapyear;
    Leapyear = IsLeapYear(y);
    if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12)
    {
        return 31;
    }
    else if (m == 4 || m == 6 || m == 9 || m == 11)
    {
        return 30;
    }
    else if (Leapyear == 1)
    {
        return 29;
    }
    else
    {
        return 28;
    }
 
}
 
void Print_Month_Head(int m)
{    
 
    if (m == 1)
    {
        cout << "\n January      Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 2)
    {
        cout << "\n February     Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 3)
    {
        cout << "\n March        Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 4)
    {
        cout << "\n April        Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 5)
    {
        cout << "\n May          Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 6)
    {
        cout << "\n June         Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 7)
    {
        cout << "\n July         Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 8)
    {
        cout << "\n August       Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 9)
    {
        cout << "\n September    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 10)
    {
        cout << "\n October      Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else if (m == 11)
    {
        cout << "\n November     Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
    else
    {
        cout << "\n December     Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
    }
 
}