#include <iostream>

using namespace std;

#define rep(i,n) for(int i = 0; i < (n); i++)

typedef long long ll;
typedef long double lld;

const int INF = 1001001001;
const int MOD = 1000000007;
const lld PI = 3.14159265358979;

int main () {
    //cout << fixed << setprecision(15);
    string s;
    cin >> s;
    int ans1 = INF;
    int ans2 = INF;
    char op = 'x';
    int n = s.size();
    for (int i = 0; i < n; i++) {
        //cout << ans1 << " : " << ans2 << endl;
        if ('0' <= s[i] && s[i] <= '9') {
            if (op == 'x') {
                if (ans1 == INF) {
                    ans1 = 0;
                }
                ans1 *= 10;
                ans1 += int(s[i] - '0');
            } else {
                if (ans2 == INF) {
                    ans2 = 0;
                }
                ans2 *= 10;
                ans2 += int(s[i] - '0');
            }
        } else {
            if (op == 'x') {
                op = s[i];
            } else {
                if (op == '+') {
                    ans1 = ans1 * ans2;
                } else {
                    ans1 = ans1 + ans2;
                }
                ans2 = INF;
            }
            op = s[i];
        }
    }
    if (op == '+') {
        ans1 = ans1 * ans2;
    } else {
        ans1 = ans1 + ans2;
    }
    cout << ans1 << endl;
    return 0;
}