Scanner sc = new Scanner(System.in);
       int sum = 0;
       String b = "";
       do {
          if(sc.hasNextInt()) {
              sum += sc.nextInt();
          } else {
              b = sc.nextLine();
          }
           sc.nextLine();
       } while(!Objects.equals(b, "сумма"));
           System.out.println(sum);
       }
   }