public class Solution
{
    public static void main(String[] args)   throws Exception
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String numberS = null;
        int number1 = 0;
        int sum = 0;
        while(numberS != "сумма")
        {
            numberS = reader.readLine();
            if (numberS.equals("сумма")){
                break;
            }
            number1 = Integer.parseInt(numberS);
            sum += number1;

        }
        System.out.print(sum);
        //напишите тут ваш код
    }
}