#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
using namespace std;

int sstoii(std::string str){
	int ret;
	std::stringstream ss;
	ss << str;
	ss >> ret;
	return ret;
}

int main(){
	string s, op="", now="";
	int a, b, ans, cnt=0;
	bool m = false;
	cin >> s;

	for(int i = 0; i < s.size(); i++){
		if(s.at(i) == '+' || s.at(i) == '-'){
			if(cnt != 0){
				ans = sstoii(now);
				if(m)	ans *= -1;
				a = ans;
				now = "";
				m = false;
				cnt = 0;
				op.append(1, s.at(i));
			}else{
				if(s.at(i) == '-')	m = true;
			}

		}else{
			now.append(1, s.at(i));
			cnt++;
		}
	}
	ans = sstoii(now);
	if(m)	ans *= -1;
	b = ans;

	if(op == "+")
		ans = a - b;
	if(op == "-")
		ans = a + b;
	printf("%d\n", ans);
	return 0;
}