awk '                            ##Starting awk program from here.
FNR==NR{                         ##Checking condition FNR==NR which will be TRUE when Input_file is being read first time.
  if($0~/^[0-9]+/){              ##Checking condition if a line starts from digit then do following.
     ++count                     ##Increment variable count with 1, each time cursor comes here.
  }                              ##Closing BLOCK for if condition here.
  sum[count]+=$NF                ##Creating an array named sum with index of count and keep on adding value of $NF to its own value.
  next                           ##next will skip all further statements from here.
}                                ##Closing BLOCK for condition FNR==NR here.
/^[0-9]+/{                       ##Checking condition if a line starts from digit then do following.
  print $0,sum[++var]            ##Printing current line and array sum with index of variable var with its increment of 1 each time cursor comes here.
  next                           ##next will skip all further statements from here.
}                                ##Closing BLOCK for /^[0-9]+/ condition here.
1                                ##Mentioning 1 for printing edited/non-edited line here.
'  Input_file  Input_file        ##Mentioning Input_file 2 times here.