#include <iostream>
#include <string>
#include <stack>
#include <sstream>
#include <cmath>
#include <map>
#include <functional>
#include <stdexcept>

using namespace std;

double Calculate(const string& expression, const map<char, pair<unsigned, function<double(double, double)>>>& Operators) throw(invalid_argument)
{
	stack<pair<double, signed char> > s;
	double Result=0, newNum;
	char oldOperator='\0', newOperator;
	istringstream iss(expression);

	while (true)
	{
		if (!(iss >> newNum))
		{
			iss.clear();
			if (iss.get()=='(')
			{
				s.push(make_pair(Result, -oldOperator));
				oldOperator='\0';
				continue;
			}
			else
				throw invalid_argument("非法字符或语法错误");
		}
NEXT:
		if (!(iss >> newOperator))
			break;
		if (Operators.find(newOperator)==Operators.end())
		{
			if (newOperator==')')
			{
				Result=Operators.find(oldOperator)->second.second(Result, newNum);
				while (true)
				{
					if (s.empty())
						throw invalid_argument("括号不匹配，缺少左括号");
					if (s.top().second>0)
					{
						Result=Operators.find(s.top().second)->second.second(s.top().first, Result);
						s.pop();
					}
					else
					{
						oldOperator=-s.top().second;
						newNum=Result;
						Result=s.top().first;
						s.pop();
						goto NEXT;
					}
				}
			}
			else
				throw invalid_argument("非法运算符");
		}
		if (Operators.find(newOperator)->second.first>Operators.find(oldOperator)->second.first)
		{
			s.push(make_pair(Result, oldOperator));
			Result=newNum;
		}
		else
		{
			Result=Operators.find(oldOperator)->second.second(Result, newNum);
			if (Operators.find(newOperator)->second.first<Operators.find(oldOperator)->second.first)
			{
				while (!s.empty() && s.top().second>0 && Operators.find(newOperator)->second.first<Operators.find(s.top().second)->second.first)
				{
					Result=Operators.find(s.top().second)->second.second(s.top().first, Result);
					s.pop();
				}
			}
		}
		oldOperator=newOperator;
	}

	Result=Operators.find(oldOperator)->second.second(Result, newNum);
	while (!s.empty())
	{
		if (s.top().second<=0)
			throw invalid_argument("括号不匹配，缺少右括号");
		Result=Operators.find(s.top().second)->second.second(s.top().first, Result);
		s.pop();
	}
	return Result;
}

int main()
{
	string s;
	map<char, pair<unsigned, function<double(double, double)>>> Operators;
	{
		Operators['+']=make_pair(1, plus<double>());
		Operators['-']=make_pair(1, minus<double>());
		Operators['*']=make_pair(2, multiplies<double>());
		Operators['/']=make_pair(2, divides<double>());
		Operators['^']=make_pair(3, [](double a, double b){return pow(a,b);});
		Operators['\0']=make_pair(~0, [](double, double b){return b;});
	}
	while (getline(cin, s) && s.empty());
	try
	{
		cout << Calculate(s, Operators) << endl;
	}
	catch (exception& e)
	{
		cerr << e.what() << endl;
	}
	return 0;
}