#include <bits/stdc++.h>
using namespace std;
int main() {
    #ifdef DEBUG
    std::ifstream in("/home/share/inputf.in");
    std::cin.rdbuf(in.rdbuf());
    #endif
    int ans = 0;
    int n;
    char c;
    cin >> ans;
    while(true) {
        cin >> c;
        if(cin.fail()) break;
        cin >> n;
        if(c == '*') {
            ans += n;
        } else {
            // c == '+'
            ans *= n;
        }
    }
    cout << ans << endl;
    return 0;
}