talha

#include<stdio.h>
int main()
{
  double a[12][12],sum=0,avg;
  char ch;
  int i,j,n;
  scanf("%d",&n);
  scanf(" %c",&ch);


      for(i=0;i<12;i++)
      {
          for(j=0;j<12;j++)
            {
             scanf("%lf",&a[i][j]);
               if(i==n)
               {sum+=a[i][j];}
             }
      }

if(ch=='S')
 printf("%.2lf\n",sum);
else if(ch=='M')
printf("%.2lf\n",sum/12.0);

  return 0;


}