program andnoid

integer,allocatable,dimension(:)::x
integer::N,k,exp

read(*,*)N
allocate(x(N))
read(*,*)x(:)

exp=0
do k=1,N
 exp=int(x(k)/2)+exp
end do

 exp=exp-maxval(int(x/2))+maxval(x)

write(*,*)exp

end program andnoid