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

int main() {
	string s;
	cin >> s;
	int ans = 0;
	int i = 0;
	while (s[i] != '*'&&s[i] != '+') {
		ans *= 10;
		ans += s[i++] - '0';
	}
	while (i < s.size()) {
		char c = s[i++];
		int num = 0;
		while (s[i] != '*'&&s[i] != '+'&&i<s.size()) {
			num *= 10;
			num += s[i++] - '0';
		}
		if (c == '*') {
			ans += num;
		}
		else if (c == '+') {
			ans *= num;
		}
	}
	cout << ans << endl;
	return 0;
}