#include <cstdio>
#include <string>
#include <iostream>
#include <stack>
#include <string>
using namespace std;

string expression;

bool isOperator(char ch) {
	return ch == '+' || ch == '-' || ch == '*' || ch == '/';
}

int getPriority(char ch) {
	if (ch == '+' || ch == '-') {
		return 1;
	} else if (ch == '*' || ch == '/') {
		return 2;
	}
	return -1;
}

void applyOperator(stack<int>& numbers, char op) {
	int secondNo = numbers.top();
	numbers.pop();
	int firstNo = numbers.top();
	numbers.pop();

	switch (op) {
		case '+': {
			numbers.push(firstNo + secondNo);
			break;
		}
		case '-': {
			numbers.push(firstNo - secondNo);
			break;
		}
		case '*': {
			numbers.push(firstNo * secondNo);
			break;
		}
		case '/': {
			numbers.push(firstNo / secondNo);
			break;
		}
	}
}

int main() {
	freopen("evaluare.in", "r", stdin);
	freopen("evaluare.out", "w", stodut);

	cin >> expression;
	stack<int> numbers;
	stack<char> operators;

	for (size_t i = 0; i < expression.size(); i++) {
		if (expression[i] == '(') {
			operators.push('(');
		} else if (expression[i] == ')') {
			while (operators.top() != '(') {
				applyOperator(numbers, operators.top());
				operators.pop();
			}
			operators.pop();
		} else if (isOperator(expression[i])) {
			while (!operators.empty() && getPriority(operators.top()) >= getPriority(expression[i])) {
				applyOperator(numbers, operators.top());
				operators.pop();
			}
			operators.push(expression[i]);
		} else {
			assert(isdigit(expression[i]));
			int number = 0;
			while (i < expression.size() && isdigit(expression[i])) {
				number = number * 10 + expression[i++] - '0';
			}
			i--;
			numbers.push(number);
		}
	}

	while (!operators.empty()) {
		applyOperator(numbers, operators.top());
		operators.pop();
	}

	cout << numbers.top() << "\n";
	return 0;
}