#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
    string s;
    cin >> s;
    int n = s.size();

    vector<int> nums;
    vector<char> opes;
    int now = 0;
    for (int i = 0; i < n;) {
        while (i < n && isdigit(s[i]))now *= 10, now += s[i] - '0', i++;
        nums.push_back(now), now = 0;
        if (i < n)opes.push_back(s[i]), i++;
    }

    int ret = nums[0];
    for (int i = 0; i < opes.size(); i++) {
        if (opes[i] == '*')ret += nums[i + 1];
        else ret *= nums[i + 1];
    }
    cout << ret << endl;
    return 0;
}