#include <iostream>
#include <cctype>
#include <assert.h>
using namespace std;

int main() {
    string exprs;
    cin >> exprs;

    auto p = 0, ans = 0, op = -1;
    while (p < exprs.size()) {
        if (isdigit(exprs[p])) {
            int num = 0;
            while (isdigit(exprs[p])) {
                num = num * 10 + exprs[p++] - '0';
            }
            if (op < 0) ans = num;
            else if (op == '+') {
                ans = ans * num;
            } else if (op == '*') {
                ans = ans + num;
            } else {
                throw "unknown op";
            }
        } else {
            op = exprs[p++];
        }
    }
    cout << ans << endl;

    return 0;
}