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

typedef long long ll;

int main() {
	string s;
	cin >> s;
	vector<string> S(111);
	int j=0;
	for (int i = 0; i < s.length(); i++) {
		if(s[i]=='+' || s[i]=='*') j++;
		else S[j].push_back(s[i]);
	}
	int ans= stoi(S[0]); j=1;
	for (int i = 0; i < s.length(); i++) {
		if (s[i] == '*') {
			ans += stoi(S[j++]);
		}
		else if (s[i] == '+') {
			ans *= stoi(S[j++]);
		}
	}
	cout << ans << endl;
}