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

int main() {
    string s;
    cin >> s;
    int n = s.size();
    int i = 0;
    int ans = 0;
    while (i < n && isdigit(s[i])) {
        ans *= 10;
        ans += s[i] - '0';
        i++;
    }
    while (i < n) {
        int num = 0;
        if (s[i] == '*') {
            while (i < n && isdigit(s[i])) {
                num *= 10;
                num += s[i] - '0';
                i++;
            }
            ans += num;
        } else if (s[i] == '+') {
            while (i < n && isdigit(s[i])) {
                num *= 10;
                num += s[i] - '0';
                i++;
            }
            ans *= num;
        }
    }
    cout << ans << endl;
    return 0;
}