local mfl, mce = math.floor, math.ceil
x = io.read()
if x:find("%.") then
  a, b = x:match("(%d+)%.(%d+)")
  a = tonumber(a)
  bn = #b
  b = tonumber(b)
  denom = 1
  for i = 1, bn do
    denom = denom * 10
  end
  c = a * denom + b
  while c % 2 == 0 and denom % 2 == 0 do
    c = mfl(c / 2)
    denom = mfl(denom / 2)
  end
  while c % 5 == 0 and denom % 5 == 0 do
    c = mfl(c / 5)
    denom = mfl(denom / 5)
  end
  print(c .. "/" .. denom)
else
  print(x .. "/1")
end