#include<fstream>
#include<iostream>
#include<vector>
#include<string>
#include<string.h>
#define MAX 100005
using namespace std;

ifstream f("evaluare.in");
ofstream g("evaluare.out");

char a[MAX];
vector<char> op;
vector<int> numbers;
string fin;
void postfix()
{
	int n = strlen(a);
	for (int i = 0; i < n; ++i)
	{
		int nr = 0;
		bool number = false;
		while (i < n && a[i] >= '0' && a[i] <= '9')
		{
			number = true;
			nr = nr * 10 + a[i] - '0';
			i++;
		}
		if (number)
		{
			fin += to_string(nr) + ' ';
			i--;
			continue;
		}
		if (a[i] == '*' || a[i] == '/')
		{
			while (op.size() != 0 && op[op.size() - 1] != '(' && op[op.size() - 1] != '+' && op[op.size() - 1] != '-')
			{
				fin += op[op.size() - 1];
				op.pop_back();
			}
			op.push_back(a[i]);
		}
		else if (a[i] == '+' || a[i] == '-')
		{
			while (op.size() != 0 && op[op.size() - 1] != '(')
			{
				fin += op[op.size() - 1];
				op.pop_back();
			}
			op.push_back(a[i]);
		}
		else
		{
			while (op.size() != 0 && op[op.size() - 1] != '(')
			{
				fin += op[op.size() - 1];
				op.pop_back();
			}
			if(op.size() != 0)
				op.pop_back();
		}
	}
	while (op.size() != 0)
	{
		fin += op[op.size() - 1];
		op.pop_back();
	}
}

int calculate(int a, int b, char op)
{
	switch (op)
	{
	case '+':
		return a + b;
		break;
	case '-':
		return a - b;
		break;
	case '*':
		return a * b;
		break;
	case '/':
		return a / b;
		break;
	}
}

int eval()
{
	for (int i = 0; i < fin.size(); ++i)
	{
		int nr = 0;
		bool number = false;
		while (fin[i] >= '0' && fin[i] <= '9')
		{
			nr = nr * 10 + fin[i] - '0';
			i++;
			number = true;
		}
		if (number)
		{
			numbers.push_back(nr);
		}
		else if (fin[i] != ' ')
		{
			int val = calculate(numbers[numbers.size() - 2], numbers[numbers.size() - 1], fin[i]);
			numbers.pop_back();
			numbers.pop_back();
			numbers.push_back(val);
		}
	}
	return numbers[0];
}

int main()
{
	f.getline(a, MAX);
	postfix();
	g<<eval();
}