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

int main()
{
    string S;
    cin >> S;
    int N = S.size();
    vector<int> A(1);
    vector<char> B;
    for (int i = 0; i < N; i++)
    {
        if (S[i] != '*' && S[i] != '+')
        {
            A.back() = A.back() * 10 + (S[i] - '0');
        }
        else
        {
            B.push_back(S[i]);
            A.push_back(0);
        }
    }
    int ans = A[0];
    for (int i = 1; i < A.size(); i++)
    {
        if (B[i - 1] == '*')
        {
            ans += A[i];
        }
        else
        {
            ans *= A[i];
        }
    }
    cout << ans;
}