#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; ++i)
#define all(a) (a).begin(),(a).end()

int main() {
    cin.tie(nullptr);
    
    string S;
    cin >> S;
    int siz = S.size();
    
    vector<ll> num;
    int x = 0;
    rep(i, 0, siz) {
        if (S[i] == '*' || S[i] == '+') {
            num.push_back(x);
            x = 0;
        } else {
            x *= 10;
            x += S[i] - '0';
        }
    }
    num.push_back(x);
    
    int index = 1;
    ll ans = num[0];
    rep(i, 0, siz) {
        if (S[i] == '*') {
            ans += num[index];
            index++;
        } else if (S[i] == '+') {
            ans *= num[index];;
            index++;
        }
    }
    
    cout << ans << '\n';
}