题解 | #四则运算#，还是大佬们厉害，这个对象以前都没玩过

import java.util.*;
import javax.script.*;

public class Main{
    public static void main(String[] args) throws ScriptException {
        Scanner scan = new Scanner(System.in);
        String input = scan.nextLine();
        input = input.replace("[", "(");
        input = input.replace("]", ")");
        input = input.replace("{", "(");
        input = input.replace("}", ")");
        // 利用java执行Script语句
        ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
        ScriptEngine engine = scriptEngineManager.getEngineByName("nashorn");
        System.out.println(engine.eval(input));
    }
}