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

int main() {
	string s; cin >> s;
	char* i;
	int sum = strtol(s.c_str(), &i, 10);
	while (*i!='\0') {
		sum = *i == '*' ? sum + strtol(i + 1, &i, 10)
		                : sum * strtol(i + 1, &i, 10);
	}
	cout << sum << endl;
}