#include<iostream>
#include<string>
using namespace std;
int ans, tmp, op;

void calc()
{
	if (op) ans *= tmp;
	else ans += tmp;
	tmp = 0;
}
int main()
{
	string s; cin >> s;
	for (int i = 0; i < s.size(); i++){
		if (s[i] == '*'){
			calc();
			op = 0;
		}
		else if (s[i] == '+'){
			calc();
			op = 1;
		}
		else{
			tmp *= 10;
			tmp += s[i] - '0';
		}
	}
	calc();
	cout << ans << endl;
	return 0;
}