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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    string s;
    cin >> s;
    bool plus = true;
    ll cur = 0, ans = 0;
    for(int i = 0; i < s.size(); i++){
        if(isdigit(s[i])){
            cur *= 10;
            cur += s[i] - '0';
        }else{
            if(plus) ans += cur;
            else ans *= cur;
            plus = s[i] == '*';
            cur = 0;
        }
    }
    if(plus) ans += cur;
    else ans *= cur;
    cout << ans << '\n';
}