#include <iostream>
#include <string>
using namespace std;
int main() {
	string S; cin >> S;
	int ans = 0, mul = 1;
	int temp = 0;
	char pre_symbol = '\0', symbol = '\0';
	for (int i = 0; i < S.length();i++) {
		if (S[i] == '*' || S[i] == '+') {
			if (symbol == '\0') {
				symbol = S[i];
				ans = temp;
				temp = 0;
			}
			else {
				pre_symbol = symbol;
				symbol = S[i];
				if (pre_symbol == '*') { ans += temp; }
				else { ans *= temp; }
				temp = 0;
			}
			continue;
		}
		temp = 10*temp + (S[i] - '0');
	}
	if (symbol == '*') { ans += temp; }
	else { ans *= temp; }
	cout << ans << endl;
	return 0;
}