#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;

stack <int> number;
stack <char> symbol;

string str;
int len, num;
bool flag = false;

int bank(char s)
{
	if (s == '+' or s == '-')
		return 10;
	else if (s == '*' or s == '/')
		return 20;
	else if (s == '^')
		return 30;
	return 0; 
}

void calc()
{
	int ans;
	int b = number.top();  number.pop();
	int a = number.top();  number.pop();
	char s = symbol.top(); symbol.pop();
	switch(s)
	{
		case '+':
		{
			ans = a + b;
			break; 
		}
		case '-':
		{
			ans = a - b;
			break;
		}
		case '*':
		{
			ans = a * b;
			break;
		}
		case '/':
		{
			ans = a / b;
			break;
		}
		case '^':
		{
			ans = pow(a, b);
			break;
		}
	}
	number.push(ans);
}

void printtt()
{


int main()
{
	cin >> str;
	len = str.size();
	for (int i = 0; i < len; i++)
	{
		if (str[i] >= '0' and str[i] <= '9')
		{
			num *= 10, num += str[i] - '0';
			flag = true;
		}
		else
		{
			if (flag)
			{
				number.push(num);
				num = 0, flag = false;
			}

			if (str[i] == '(')
				symbol.push(str[i]);
			else if (str[i] == ')')
			{
				while (symbol.top() != '(')
					calc();
				symbol.pop(); 
			}
			else
			{
				while (!symbol.empty() and bank(symbol.top()) >= bank(str[i]))
					calc();
				symbol.push(str[i]);
			}
		}
	}
	if (flag)
		number.push(num);
	while (!symbol.empty())
		calc();
	cout << number.top();

	return 0;
}