#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0, i##_len = (n); i < i##_len; i++)
#define reps(i, s, n) for(ll i = (s), i##_len = (n); i < i##_len; i++)
#define rrep(i, n) for(ll i = (n) - 1; i >= 0; i--)
#define rreps(i, e, n) for(ll i = (n) - 1; i >= (e); i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((ll)(x).size())
#define len(x) ((ll)(x).length())

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    // ifstream in("input.txt");
    // cin.rdbuf(in.rdbuf());
    string s;
    cin >> s;
    s += '=';
    ll n = len(s);
    ll ans = 0;
    ll tmp = 0;
    char c = '=';
    rep(i, n) {
        if ((s[i] >= '0') && (s[i] <= '9')) {
            tmp = tmp * 10 + (s[i] - '0');
        }
        else {
            if (c == '*') {
                ans += tmp;
                tmp = 0;
            }
            else if (c == '+') {
                ans *= tmp;
                tmp = 0;
            }
            else {
                ans = tmp;
                tmp = 0;
            }
            c = s[i];
        }
    }
    cout << ans << endl;
    return 0;
}