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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
int main(void){
    /* 変数宣言，ちゃんと初期化しよう */
    int N = 0;
    int ans = 0;
    
    /* 変数宣言終わり */
    
    /* 入力を受け付ける部分*/
    
    // %dはdecimalの略．つまり，入力を10進数として扱うよという意味．
    scanf("%d", &N);
    
    /* 入力を受け付ける部分終わり*/
    
    
    /* 何か処理*/
    ans = N;
    // if(ans % 111 == 0){
    // }else{
    // ans = ((ans-1) / 111 +1) *111;
    // }
    
    
    ans = ((ans-1) / 111 +1) *111;
    
    for(int i = 0; i < 10; i++){ 
      // i = 0,1,2,3,4,5,6,7,8,9のとき処理される
      
    }
    
    /* 何か処理終わり*/
    
    
    /* 出力する部分*/
 // %dの部分にansの値が表示される
    
    /* 出力する部分*/
    printf("%d",ans);
    
    
    return 0;
}