#!/usr/bin/ruby
# encoding: utf-8

# ABC 111 B

N = gets.chomp.to_i

if 100 <= N and N <= 111 then 
  p 111
elsif 111 < N and N <= 222 then
  p 222
elsif 222 < N and N <= 333 then
  p 333
elsif 333 < N and N <= 444 then
  p 444
elsif 444 < N and N <= 555 then
  p 555
elsif 555 < N and N <= 666 then
  p 666
elsif 666 < N and N <= 777 then
  p 777
elsif 777 < N and N <= 888 then
  p 888
elsif 888 < N and N <= 999 then
  p 999
end
