#include <cstdio>
#include <iostream>
#include <string>
using namespace std;
int main(){
	string s, op, now;
	int a, b, ans, cnt=0;
	bool f = false, p = false, m = false;
	cin >> s;

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

	printf("%d\n", a+b);
}