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

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);

	string s; cin >> s;
	int n, j = 0;
	vector<char> ope;
	deque<int> num;
	for(int i = 0; i < s.size(); i++){
		if(i > j) j = i;
		string tmp;
		if(s[i] == '*' || s[i] == '+') {
			ope.push_back(s[i]);
			continue;
		}
		while(j < s.size() && s[j] != '*' && s[j] != '+') {
			tmp += s[j];
			j++;
		}
		i = j - 1;
		num.push_back(stoi(tmp));
	}
	for(int i = 0; i < ope.size(); i++) {
		int s = num.front(); num.pop_front();
		int t = num.front(); num.pop_front();
		if(ope[i] == '*') s += t;
		else s *= t;
		num.push_front(s);
	}
	cout << num.front() << endl;
	return 0;
}