#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;

int main() {
    string s;
    cin >> s;
    vector<int> a;
    vector<char> b = {'.'};
    string now = "";
    rep(i, (int)s.size()) {
        if (s[i] == '*' || s[i] == '+') {
            a.emplace_back(stoi(now));
            now = "";
            b.emplace_back(s[i]);
        } else {
            now += s[i];
        }
    }
    a.emplace_back(stoi(now));
    int ans = a[0];
    for (int i = 1; i < (int)a.size(); i++) {
        if (b[i] == '*') {
            ans += a[i];
        } else {
            ans *= a[i];
        }
    }
    cout << ans << endl;
}