[백준] 2754번

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

public class Main {
   public static void main(String[] args) throws IOException {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      String score = br.readLine();
      double ans = 0.0;

      switch(score) {
         case "A+":
            ans = 4.3;
            break;
         case "A0":
            ans = 4.0;
            break;
         case "A-":
            ans = 3.7;
            break;
         case "B+":
            ans = 3.3;
            break;
         case "B0":
            ans = 3.0;
            break;
         case "B-":
            ans = 2.7;
            break;
         case "C+":
            ans = 2.3;
            break;
         case "C0":
            ans = 2.0;
            break;
         case "C-":
            ans = 1.7;
            break;
         case "D+":
            ans = 1.3;
            break;
         case "D0":
            ans = 1.0;
            break;
         case "D-":
            ans = 0.7;
            break;
         case "F":
            ans = 0.0;
            break;
      }
      System.out.println(ans);
   }
}