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import java.util.*;

class Solution {
    public int solution(String my_string) {
        int answer = 0;
        String[] res = my_string.split(" ");
        answer = Integer.parseInt(res[0]); // 첫번째 값 저장.

        for(int i = 1; i < res.length; i++){
            if(i%2!=0){
                if(res[i].equals("+")){
                    answer += Integer.parseInt(res[i+1]);
                } else {
                    answer -= Integer.parseInt(res[i+1]);
                }    
            }
        }

        return answer;
    }
}