#include<iostream.h>
#include<conio.h>
#include<iomanip.h>

void main()
{
  clrscr();
  int start_day,day,i,j,num;
  static int start_month[]={31,28,31,30,31,30,31,31,30,31,30,31};
  day=start_day;
  cout<<"\nEnter the 1st day of the year : ";
  cin>>day;
  for(i=0;i<12;i++)
     {
       num=i;
       j=day;
       switch(j)
       {
     case 0 : cout<<"\n JAN \n";
          break;
     case 1 : cout<<"\n FEB \n";
          break;
     case 2 : cout<<"\n MAR \n";
          break;
     case 3 : cout<<"\n APR \n";
          break;
     case 4 : cout<<"\n MAY \n";
          break;
     case 5 : cout<<"\n JUN \n";
          break;
     case 6 : cout<<"\n JUL \n";
          break;
     case 7 : cout<<"\n AUG \n";
          break;
     case 8 : cout<<"\n SEP \n";
          break;
     case 9 : cout<<"\n OCT \n";
          break;
     case 10 : cout<<"\n NOV \n";
          break;
     case 11 : cout<<"\n DEC \n";
          break;
       }
  cout<<"\nSUN MON TUE WED THU FRI SAT\n";
  for(int k=(j-1);k>0;k--)
     cout<<" "<<" "<<" ";
  while(num<=(start_month[i]))
      {
     cout<<setw(4)<<num;
     num++;
     j++;
     if(j==7)
       {
         j=1;
         cout<<"\n";
       }
     cout<<setw(4);
     day=j;
       }
       }
   getch();
}