program main
  implicit none
  integer*8::N,a,b,c,abc,ab,bc,ca,tmp
  read *,N
  read *,a,b,c
  tmp = lcd(a,b)
  abc = N/lcd(tmp,c)
  ab  = N/tmp
  bc  = N/lcd(b,c)
  ca  = N/lcd(c,a)
  a   = N/a
  b   = N/b
  c   = N/c
  print '(i0)', a+b+c-(ab+bc+ca)+abc
contains
  function lcd(a,b) result(c)
    integer*8,intent(in)::a,b
    integer*8::c
    c = (a*b)/gcd(a,b)
  end function lcd
  recursive function gcd(a,b) result(c)
    integer*8::a,b,c
    if(b.eq.0) then
       c = a
    else
       c = gcd(b,MOD(a,b))
    end if
  end function gcd
end program main