program main
  implicit none
  integer*8::N,i,dot,len,borrow,carry
  integer*8::big,small,big_t,small_t
  integer*8,parameter::keta=10000000000_8
  character*22::input
  data big_t,small_t/2*0/
  read *,N
  do i=1,N
     read *,input
     len = LEN_TRIM(input)
     dot = SCAN(input,'.')
     if(dot.ne.0) then
        read (input(1:dot-1),*) big
        read (input(dot+1:len),*) small
        small = 10**(10-len+dot)*small
     else
        read (input(1:len),*) big
        small = 0
     end if
     big_t = big_t + big
     if(input(1:1).eq.'-') then
        small_t = small_t - small
     else
        small_t = small_t + small
     end if
!     print '(i0," ",i0," ",i0," ",i0)',big,small,big_t,small_t
  end do

  if(small_t.ge.0) then
     carry = small_t/keta
     big_t = big_t + carry
     small_t = MOD(small_t,keta)
  else
     borrow = small_t/keta+1
     big_t = big_t - borrow
     small_t = borrow*keta - small_t
  end if
  print '(i0,".",i10.10)',big_t,small_t

end program main