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

int main(void) {
	string S;
	cin >> S;
	int N = S.size();
	
	vector<string> val = {string(1, S[0])};
	vector<char> op;
	for(int i = 1; i < N; ++i) {
		if(S[i] == '*' or S[i] == '+') {
			op.push_back(S[i]);
			val.push_back(string(1, S[i + 1]));
			i += 1;
		}
		else val.back() += S[i];
	}
	
	int M = op.size();
	int ans = stoi(val[0]);
	for(int i = 0; i < M; ++i) {
		if(op[i] == '*') ans += stoi(val[i + 1]);
		else ans *= stoi(val[i + 1]);
	}
	
	cout << ans << "\n";
	
	return 0;
}