t = {}
for i = 1, 6 do t[i] = io.read("*n") end
table.sort(t)
z = 0
for i = 2, 5 do z = z + t[i] end
z = z * 25
w = tostring(z)
if z < 10 then
  print("0.0" .. w)
elseif z < 100 then
  print("0." .. w)
else
  print(w:sub(1, #w - 2) .. "." .. w:sub(#w - 1, #w))
end