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class Solution {
    public int solution(String my_string) {

        String[] arr = my_string.split(" ");
        int n = arr.length;
        int answer = Integer.parseInt(arr[0]);

        for (int i=1; i<n; i+=2) {
            if (arr[i].equals("+")) {
                answer += Integer.parseInt(arr[i+1]);
            } else {
                answer -= Integer.parseInt(arr[i+1]);
            }
        }

        return answer;

    }
}