#include <iostream>
#include <string>

using namespace std;

int main() {
	string s;
	cin >> s;
	enum {
		STATE_SIGN1,
		STATE_DIGITS1,
		STATE_SIGN2,
		STATE_DIGITS2
	} state = STATE_SIGN1;
	int sign1 = 1, sign2 = 1;
	int value1 = 0, value2 = 0;
	int op = 0;
	for (size_t i = 0; i < s.size(); ++i) {
		char ch = s[i];
		switch (state) {
		case STATE_SIGN1:
			if (ch == '+') {
			} else if (ch == '-') {
				sign1 = -1;
			} else {
				value1 = (int)(ch - '0');
			}
			state = STATE_DIGITS1;
			break;
		case STATE_DIGITS1:
			if (ch == '+') {
				op = -1;
				state = STATE_SIGN2;
			} else if (ch == '-') {
				op = 1;
				state = STATE_SIGN2;
			} else {
				value1 *= 10;
				value1 += (int)(ch - '0');
			}
			break;
		case STATE_SIGN2:
			if (ch == '+') {
			} else if (ch == '-') {
				sign2 = -1;
			} else {
				value2 = (int)(ch - '0');
			}
			state = STATE_DIGITS2;
			break;
		case STATE_DIGITS2:
			value2 *= 10;
			value2 += (int)(ch - '0');
			break;
		}
	}
	int result = sign1 * value1 + sign2 * value2 * op;
	cout << result << endl;
	return 0;
}