#include <iostream>
#include <string>
#include <stack>
using namespace std;

int main() {
    string S;
    cin >> S;

    int res = 0;
    string curnum = "";
    char curop = '\0';
    for (char c : S) {
        if (c == '*' || c == '+') {
            switch (curop) {
                case '*': {
                    res += stoi(curnum);
                    break;
                }
                case '+': {
                    res *= stoi(curnum);
                    break;
                }
                case '\0': {
                    res = stoi(curnum);
                    break;
                }
                default:
                    break;
            }
            curnum = "";
            curop = c;
        } else {
            curnum += c;
        }
    }

    if (curnum != "") {
        switch (curop) {
            case '*': {
                res += stoi(curnum);
                break;
            }
            case '+': {
                res *= stoi(curnum);
                break;
            }
            case '\0': {
                res = stoi(curnum);
                break;
            }
            default:
                break;
        }
    }

    cout << res << endl;
}