#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>
#include <cctype>

using namespace std;

int main() {
	string s;

	cin >> s;
	int n = s.size();
	int ans = 0;

	int tmp;
	bool adds = true;
	for (int i = 0; i < s.size(); i++) {
		switch (s[i]) {
		case '*': case '+':
			ans = adds ? ans + tmp : ans * tmp;
			adds = (s[i] == '*');
			tmp = 0;
			break;
		default:
			tmp = tmp * 10 + s[i] - '0';
			break;
		}
	}
	ans = adds ? ans + tmp : ans * tmp;
	cout << ans << endl;

	return 0;
}