#include<iostream>
#include<string>
using namespace std;

int main()
{
	string s;
	int l, i, ans = 0, a = 0, b = 0;
	cin >> s;
	l = s.length();
	for (i = 0; i < l; i++) {
		if (s[i] >= '0' && s[i] <= '9') a = a * 10 + s[i] - '0';
		else if (s[i] == '*') {
			if (b == 0)ans += a;
			else ans *= a;
			b = 0;
			a = 0;
		}
		else if (s[i] == '+') {
			if (b == 0)ans += a;
			else ans *= a;
			b = 1;
			a = 0;
		}
	}
	if (b == 0)ans += a;
	else ans *= a;
	cout << ans << endl;
	return 0;
}