Problem:
Score : 200 points

Problem Statement

Kurohashi has never participated in AtCoder Beginner Contest (ABC).

The next ABC to be held is ABC N (the N-th ABC ever held).
Kurohashi wants to make his debut in some ABC x such that all the digits of x in base ten are the same.

What is the earliest ABC where Kurohashi can make his debut?

Constraints

100 \leq N \leq 999

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

If the earliest ABC where Kurohashi can make his debut is ABC n, print n.

Sample Input 1

111

Sample Output 1

111

The next ABC to be held is ABC 111, where Kurohashi can make his debut.

Sample Input 2

112

Sample Output 2

222

The next ABC to be held is ABC 112, which means Kurohashi can no longer participate in ABC 111.
Among the ABCs where Kurohashi can make his debut, the earliest one is ABC 222.

Sample Input 3

750

Sample Output 3

777

Solution in Ruby (2.3.3) (judge verdict: Accepted)

N = gets.to_i
ans = 0

if N <= 111
    ans = 111
elsif N <= 222
    ans = 222
elsif N <= 333
    ans = 333
    elsif N <= 444
    ans = 444
    elsif N <= 555
    ans = 555
    elsif N <= 666
    ans = 666
    elsif N <= 777
    ans = 777
    elsif N <= 888
    ans = 888
    elsif N <= 999
    ans = 999
    end

puts ans