#include<iostream>
#include<string>

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

	char op;
	int op_iter;
	int ans;
	for (int i = 1; i < str.length(); i++) {
		if (str[i] < '0') {
			int a = std::stoi(str.substr(0, i));
			int b = std::stoi(str.substr(i + 1, str.size() - i));
			if (str[i] == '+') {
				ans = a - b;
			} else {
				ans = a + b;
			}
			break;
		}
	}

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