(SPOJ) 8705 - Pedágio - 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 distancia = Integer.valueOf(tokenizer.nextToken());
        int distanciaEntrePedagio = Integer.valueOf(tokenizer.nextToken());       
       
        line = br.readLine();
        tokenizer = new StringTokenizer(line);
        int custoPorKM = Integer.valueOf(tokenizer.nextToken());
        int custoPedagio = Integer.valueOf(tokenizer.nextToken());
       
        System.out.println((custoPorKM*distancia)+((distancia/distanciaEntrePedagio)*custoPedagio));
                   
        return;
    }
}