#include <bits/stdc++.h>
using namespace std;

int main()
{
	string s;
	cin >> s;
	int ans = 0;
	int cnt = 0;
	char last = '*';
	for(int i = 0; i < (int)s.size(); i++)
	{
		if(s[i] == '*' || s[i] == '+')
		{
			if(last == '*') ans += cnt;
			else ans *= cnt;
			last = s[i];
			cnt = 0;
		}
		else
		{
			cnt *= 10;
			cnt += s[i] - '0';
		}
	}
	
	if(last == '*') ans += cnt;
	else ans *= cnt;
	cout << ans << endl;
	return 0;
}