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,allocatable::input(:)

  data big_t,small_t/2*0/
  read *,N
  allocate(input(N))
  read *, input

  do i=1,N
     len = LEN_TRIM(input(i))
     dot = SCAN(input(i),'.')
     if(dot.ne.0) then
        read (input(i)(1:dot-1),*) big
        read (input(i)(dot+1:len),*) small
        small = 10**(10-len+dot)*small
     else
        read (input(i)(1:len),*) big
        small = 0
     end if
     if(input(i)(1:1).eq.'-') then
        small = -small
     end if
     big_t = big_t + big
     small_t = small_t + small
  end do

  if(big_t.eq.0) then
     carry = small_t/keta
     big_t = big_t + carry
     if(big_t.eq.0.and.small_t.lt.0) then
        write(*,'(a)',advance='no'),"-"
     end if
     small_t = ABS(MOD(small_t,keta))
  else if((small_t.ge.0.and.big_t.ge.0).or. &
       (small_t.le.0.and.big_t.le.0)) then
! same sign
     carry = small_t/keta
     big_t = big_t + carry
     small_t = ABS(MOD(small_t,keta))
  else
! diff sign
     if(big_t.le.0) then
        big_t   = -big_t
        small_t = -small_t
        write(*,'(a)',advance='no'),"-"
     end if
     borrow = ABS(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