n = gets.to_i

i = 1
j = 0
k = n - 1
min = i + j + k

j = 2
i = (n ** (1.0 / j.to_f)).to_i
k = n - i**j
min = [min, i + j + k].min

while i >= 2 do
	j += 1
	f = n ** (1.0 / j.to_f)
	i = f.ceil ** j > n ? f.floor : f.ceil
	k = n - i**j
	min = [min, i + j + k].min
end

puts min