#include <iostream>
#include <string>

using namespace std;

int main() {
	string s;
	cin >> s;
	int result = 0;
	int currentNumber = 0;
	char lastOperator = '*';
	for (size_t i = 0; i < s.size(); ++i) {
		char ch = s[i];
		if (ch == '*' || ch == '+') {
			if (lastOperator == '*') {
				result += currentNumber;
			} else {
				result *= currentNumber;
			}
			lastOperator = ch;
			currentNumber = 0;
		} else {
			currentNumber *= 10;
			currentNumber += (int)(ch - '0');
		}
	}
	if (lastOperator == '*') {
		result += currentNumber;
	} else {
		result *= currentNumber;
	}
	cout << result << endl;
	return 0;
}