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

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

typedef string::const_iterator State;
class ParseError {};

int number(State &begin) {
    int ret = 0;

    while (isdigit(*begin)) {
        ret *= 10;
        ret += *begin - '0';
        begin++;
    }

    return ret;
}

int expression(State &begin) {
    int ret = number(begin);

    for (;;) {
        if (*begin == '+') {
            begin++;
            ret *= number(begin);
        } else if (*begin == '*') {
            begin++;
            ret += number(begin);
        } else {
            break;
        }
    }

    return ret;
}

// thanks 
// https://gist.github.com/draftcode/1357281

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    string s;
    cin >> s;

    State begin = s.begin();
    ll ans = expression(begin);
    p(ans);

    return 0;
}