#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
  
//function prototypes      
  
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 ()
  {  
    int year;
    Print_Version();  
    cin>> year;
    Print_Head(year);
  
    for(int i=1; i<=12; i++)
    {  
      Print_Month(year, i);  
    }
      cout<<"\n\n\nGoodbye!\n";
  }

//Some Functions

  void Print_Version()  
  {
    cout<<"Enter any Year After 1753 to output a very pretty calendar for that year!\n";
  }
  void Print_Head(int y)
  {
    cout<<"\n\n"<<setw(21)<<y<<endl;
  }  
  void Print_Month(int year, int month)
    {
      int firstday, number_days;

      Print_Month_Head(month);
      firstday = First_Day_Of_Month(year,month);
      number_days = Number_Days_Of_Month(year,month);
      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 year)
  {
    if(year%400 == 0)
    {
      return 1;
    }
    else if (year%4 == 0 && year%100 != 0)
    {
      return 1;  
    }
    else
      return 0;
    }
      int First_Day_Of_Month(int year, int month)
      {
          int firstday;

          for(month = 1; month<13; month++)
          {      
                if(month<3)
                {
                    month=month + 12;
                    year=year-1;
                }
            firstday = (1 + (2 * month) + ((6 * (month + 1)) / 10) + year + (year / 4) -                 
            (year / 100) + (year / 400) + 1) % 7;

          }
      return firstday;
      }
      int Number_Days_Of_Month(int year, int month)
      {
        int Leapyear;
        Leapyear = IsLeapYear(year);
            if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
            {
                return 31;
            }
            else if (month == 4 || month == 6 || month == 9 || month == 11)
            {
                return 30;
            }
            else if (Leapyear == 1)
            {
                return 29;
            }
            else
            {
                return 28;
            }
      }
    void Print_Month_Head(int month)
    {
        if(month==1)
        {
            cout<<"   ==================================";
            cout<<"\n    January\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==2)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    February\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==3)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    March\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==4)
        {
            cout<<"\n\n   ==================================";    
            cout<<"\n    April\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==5)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    May\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==6)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    June\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==7)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    July\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==8)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    August\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==9)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    September\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==10)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    October\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else if(month==11)
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    November\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
        else
        {
            cout<<"\n\n   ==================================";
            cout<<"\n    December\n\n    Sun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        }
      }