USACO Section 1.1 : Friday the Thirteenth

# include <stdio.h>

int leap(int year)
{
   if (((year%4==0)&&(year%100!=0))||(year%400==0))
      return (1);
   else 
      return (0);
}


main ()
{
   FILE *in=fopen("friday.in","r");
   FILE *out=fopen("friday.out","w");
     
   
   int month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
   int week[8]={0};
   int year,i,j,data=13;
   
   
   fscanf (in,"%d",&year);
   year+=1900;
   for (i=1900;i<year;i++)
   {
      for (j=1;j<=12;j++)
      {
         data=data%7;
         if (data==0) week[7]++;
         else week[data]++;
         
         data+=month[j];
         if ((j==2)&&(leap(i)==1))
            data++;
         
         }
      }
   
   fprintf (out,"%d %d",week[6],week[7]);
   for (i=1;i<=5;i++)
      fprintf (out," %d",week[i]);
   fprintf (out,"\n");
   fclose (in);
   fclose (out);
   exit(0);
}