#include<iostream>
#include<string>
#include<fstream>
#include<iomanip>
#include<vector>
#include<cctype>
#include<algorithm>
#include<sstream>
using namespace std;

int main()
{
	string s;
	stringstream ss;
	vector<int>v;
	vector<char>w;
	cin >> s;
	int p = 0;
	s += "#";
	for (int i = 0; i < static_cast<int>(s.size()); i++)
	{
		if (!isdigit(s[i]))
		{
			int a;
			ss << s.substr(p, i - p); ss >> a; ss.clear();
			v.push_back(a);
			if (s[i] == '*' || s[i] == '+')w.push_back(s[i]);
			p = i + 1;
		}
	}
	for (int i = 0; i < static_cast<int>(w.size()); i++)
	{
		if (w[i] == '*')v[i + 1] += v[i];
		else v[i + 1] *= v[i];
	}
	cout << v[static_cast<int>(v.size()) - 1] << endl;
	return 0;
}