#include<iostream>
#include<string>
#include<regex>

int main() {
	std::string str;
	std::cin >> str;

	for (int i = 1; i < str.length(); i++) {
		if (str[i] < '0') {
			if(str[i] == '-'){
				if(str[i + 1] == '-'){
					str.replace(i, 2, "-");
				} else if (str[i + 1] == '+') {
					str.replace(i, 2, "+");
				} else {
					str.replace(i, 1, "+");
				}
			} else {
				if (str[i + 1] == '-') {
					str.replace(i, 2, "+");
				} else if (str[i + 1] == '+') {
					str.replace(i, 2, "-");
				} else {
					str.replace(i, 1, "-");
				}
			}
		}
	}

	int i = 0, a = 0;
	if (str[0] == '+' || str[0] == '-')i++;
	for (; str[i] != '+' && str[i] != '-'; i++) {
		a *= 10;
		a += str[i] - '0';
	}

	if (str[0] == '-') {
		a *= -1;
	}

	char op = str[i];
	i++;
	int b = 0;
	for (;i < str.length();i++) {
		b *= 10;
		b += str[i] - '0';
	}

	int ans;
	if (op == '+') {
		ans = a + b;
	} else {
		ans = a - b;
	}

	std::cout << ans << std::endl;
	return 0;
}