#include <iostream>
#include <algorithm>
#include <cstring>
#pragma warning(disable:4996)

using namespace std;

char ** words = new char*[101];
char ** wordsBracket = new char*[101];

double getResult(int wordFrom, int wordTo, int wordsCount) {
	double result = 0;
	double lastBracketResult = 0;
	for (int i = wordFrom; i < wordTo; i++)
	{
		if (strcmp(wordsBracket[i], "+") == 0) {
			if (strcmp(wordsBracket[i], ")") != 0)
				result += atof(wordsBracket[i - 1]);
			else
				result += lastBracketResult;
		}
		else if(strcmp(wordsBracket[i], "*") == 0) {
			int next = i + 1;
			double multiplyResult;
			double nextBracket = 0;
			if (strcmp(wordsBracket[i-1], ")") != 0)
				multiplyResult = atof(wordsBracket[i - 1]);
			else
				multiplyResult = lastBracketResult;
			do {
				if (strcmp(wordsBracket[next], "(") == 0) {
					int secondBracket = 0;
					while (strcmp(wordsBracket[secondBracket], ")"))
						secondBracket++;
					multiplyResult *= getResult(next + 1, secondBracket, wordsCount);
					next = secondBracket;
				}
				else if (strcmp(wordsBracket[next], "*") != 0) {
					multiplyResult *= atof(wordsBracket[next]);
				}
				next++;
			} while (next < wordTo && strcmp(wordsBracket[next], "+") != 0);
			result += multiplyResult;
			i = next;
		}
		else if (strcmp(wordsBracket[i], "(") == 0) {
			int secondBracket = 0;
			while (strcmp(wordsBracket[secondBracket], ")"))
				secondBracket++;
			if(secondBracket == wordTo - 1)
				result += getResult(i + 1, secondBracket, wordsCount);
			else
				lastBracketResult = getResult(i + 1, secondBracket, wordsCount);
		}

		else if(i == wordTo - 1){
			result += atof(wordsBracket[i]);
		}
	}
	return result;
}

int main(int argc, char ** argv) {
	char * str = new char[101];
	char ** wordsAfterMultyPly = new char*[101];
	char * word;
	char * plus = new char[2];
	strcpy(plus, "+");
	char * mult = new char[2];
	strcpy(mult, "*");
	int newWordsCount = 0;
	int wordsCount = 0;
	double result = 0;
	cin.getline(str, 101);
	word = strtok(str, " ");
	do {
		wordsBracket[wordsCount] = word;
		wordsCount++;
	} while ((word = strtok(NULL, " ")) != NULL);

	result = getResult(0, wordsCount, wordsCount);

	cout << result;
	system("pause");
	return 0;
}