program main
  implicit none
  integer*8::a,b,c,ab,abc,aa,bb,cc,div
  integer*8::i
  read *,a,b,c

  ab = lcm(a,b)
  abc = lcm(ab,c)

  aa = abc/a
  bb = abc/b
  cc = abc/c

  do i=MIN(MIN(aa,bb),cc),1,-1
     if(MOD(aa,i).eq.MOD(bb,i) .and.&
          MOD(aa,i).eq.MOD(cc,i)) then
        exit
     end if
  end do

  div = gcd(abc,i)
  print '(i0,"/",i0)',abc/div,i/div
contains
  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
  function lcm(a,b) result(c)
    integer*8,intent(in)::a,b
    integer*8::c
    c = (a*b)/gcd(a,b)
  end function lcm
end program main