#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
int main()
{
    str s;
    cin >> s;
    stringstream ss(s);
    ll ans = 0;
    ss >> ans;
    char o;
    ll n;
    while (ss >> o >> n)
    {
        if (o == '*') ans += n;
        else if (o == '+') ans *= n;
    }
    cout << ans;
    return 0;
}