백준 1541

import java.io.BufferedReader;
import java.io.InputStreamReader;

class Main1541 {

   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      int ans = 0;
      String[] split = br.readLine().split("-");

      for (int i = 0; i < split.length; i++) {
         int sum = 0;
         String[] split2 = split[i].split("\\+");
         for (String sub2 : split2) {
            sum += Integer.parseInt(sub2);
         }

         if (i == 0) {
            ans += sum;
         } else {
            ans -= sum;
         }

      }

      System.out.println(ans);
   }
}