#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

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

    string er = ""s;
    char op = '-';
    llong result = 0;
    for(char c: s) {
        if(c == '*' || c == '+') {
            if(op != '-') {
                if(op == '*') result += stoi(er);
                else result *= stoi(er);
            } else {
                result = stoi(er);
            }
            er = ""s;
            op = c;
        } else {
            er += c;
        }
    }
    if(op == '*') result += stoi(er);
    else result *= stoi(er);

    cout << result << "\n";
}