(SPOJ) 12993 - Auto Estrada - Solução

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

class Main {
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main processando = new Main();
        processando.processa();
       
        System.exit(0);
    }
   
    void processa() throws NumberFormatException, IOException {
        String line = "";
       
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        line = br.readLine();
        StringTokenizer tokenizer = new StringTokenizer(line);
        int comprimento = Integer.valueOf(tokenizer.nextToken());
       
        int soma = 0;
        line = br.readLine();
        for (int i = 0; i < comprimento; i++) {
            if (line.charAt(i) == 'D') {
            }
            else if (line.charAt(i) == 'A') {
                soma += 1;
            }
            else if (line.charAt(i) == 'P') {
                soma += 2;
            }
            else if (line.charAt(i) == 'C') {
                soma += 2;
            }           
        }
       
        System.out.println(soma);

        return;
    }
}