[백준][JAVA] 1094번 막대기

1094번: 막대기

코드

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int X = Integer.parseInt(br.readLine());
		
		String s = Integer.toBinaryString(X);
		
		int answer = 0;
		
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '1') answer++;
		}
		
		System.out.println(answer);
		
	}

}