PAT 1027

简单题，进制转换

import java.util.*;
import java.io.*;

class FastReader{
    BufferedReader reader;
    StringTokenizer tokenizer;
    
    public FastReader(InputStream stream){
        reader = new BufferedReader(new InputStreamReader(stream));
        tokenizer = null;
    }
    
    public String next(){
        while (tokenizer == null || !tokenizer.hasMoreTokens()){
            try{
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (Exception e){
                throw new RuntimeException(e);
            }
        }
        
        return tokenizer.nextToken();
    }
    
    public int next_int(){
        return Integer.parseInt(next());
    }
}

public class Main {
    static String convert_base(int color){
        char[] tabulate = {
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
            'A', 'B', 'C',
        };
        
        StringBuilder res = new StringBuilder();
        char low = tabulate[color % 13];
        char high = tabulate[color / 13];
        
        res.append(high);
        res.append(low);
        
        return res.toString();
    }
    
    public static void main(String[] args){
        FastReader reader = new FastReader(System.in);
        int R, G, B;
        R = reader.next_int();
        G = reader.next_int();
        B = reader.next_int();
        
        StringBuilder res = new StringBuilder();
        res.append('#');
        res.append(convert_base(R));
        res.append(convert_base(G));
        res.append(convert_base(B));
        
        System.out.println(res);
    }
}