#include<bits/stdc++.h>
using namespace std;
int main() {
	string s;
	cin >> s;
	int num = s.at(0) - '0';
	for (int i = 2; i < s.size(); i += 2) {
		string formula = s.substr(i - 1,i);
		if (formula.at(0) == '+') num += formula.at(1) - '0';
		else num *= formula.at(1) - '0';
	}
	cout << num << endl;
}

//1*2+3*4*5