[백준][Java] 1094번 막대기 (비트마스크)

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 
 
public class Main {
        
    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    private static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
    
    
    
    public static void main(String[] args) throws IOException{
        int X = Integer.parseInt(br.readLine());
        int res = 0;
        for(int j=0; j<=6; j++) {
            if( (X&(1<<j)) !=0) res++;
        }
        
        bw.write(String.valueOf(res));
        bw.flush(); 
        bw.close();
    }
}