Problem:
Score : 100 points

Problem Statement

This contest, AtCoder Beginner Contest, is abbreviated as ABC.

When we refer to a specific round of ABC, a three-digit number is appended after ABC. For example, ABC680 is the 680th round of ABC.

What is the abbreviation for the N-th round of ABC? Write a program to output the answer.

Constraints

100 ≤ N ≤ 999

Input

Input is given from Standard Input in the following format:

N

Output

Print the abbreviation for the N-th round of ABC.

Sample Input 1

100

Sample Output 1

ABC100

The 100th round of ABC is ABC100.

Sample Input 2

425

Sample Output 2

ABC425

Sample Input 3

999

Sample Output 3

ABC999

Solution in Rust (1.15.1) (judge verdict: Wrong Answer)

fn main(){
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).unwrap();
	let n: i32 = s.trim().parse().unwrap();
	let mut c = 1;
	let mut cd = 1;
	for i in 1..(n + 1) as usize {
		let mut cs = 0;
		let mut ns = i as i32;
		loop {
			if ns > 1 {
				if ns % 2 == 0 { cs += 1;}
			} else {
				break;
			}
			ns /= 2;
		}
		if c < cs {
			c = cs;
			cd = i as i32;
		}
	}
	println!("{}", cd);
}