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

const int N = 1e5+10;

int arr[4];
char op[3];

long long solve(int sym[3],vector<int> v,int num)
{
    vector<long long> vec;
    vec.push_back(arr[num-1]);
    for(int i = 0; i < v.size();i++)
    {
        vec.push_back(arr[v[i]-1]);
        //cout << vec[i+1] << endl;
    }
    vector<char> symbols;
    for(int i = 0; i < 3; i++)
        symbols.push_back(op[sym[i]-1]);
    for(int i = 0; i < symbols.size(); i++)
    {
        if(symbols[i]=='*')
        {
            vec[i]*=vec[i+1];
            vec.erase(vec.begin()+(i+1));
            symbols.erase(symbols.begin()+i);
            i--;
        }
    }
    /*for(int i = 0; i < vec.size();i++)
        cout << vec[i] << " ";
    cout << endl;*/
    for(int i = 0; i < symbols.size(); i++)
    {
        if(symbols[i]=='+')
        {
            vec[i]+=vec[i+1];
            vec.erase(vec.begin()+(i+1));
            symbols.erase(symbols.begin()+i);
            i--;
        }
    }
    /*for(int i = 0; i < vec.size();i++)
        cout << vec[i] << " ";
    cout << endl;*/
    long long mx = -1e9;
    for(int i = 0; i < vec.size();i++)
        mx = max(mx,vec[i]);
    //cout << endl;
    //cout << mx << endl;
    return mx;
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);

    #ifndef ONLINE_JUDGE
        //freopen("input.txt", "r", stdin);
        //freopen("out.txt", "w", stdout);
    #endif // ONLINE_JUDGE

    long long ans = 1e18;


    bool zero = false;
    bool mult = false;
    for(int i = 0; i < 4;i++)
    {
        cin >> arr[i];
        if(!arr[i])
            zero = true;
    }
    for(int i = 0; i < 3; i++)
    {
        cin >> op[i];
        if(op[i]=='*')
            mult = true;
    }
    if(mult && zero)
    {
        cout << 0;
        return 0;
    }
    for(int i = 1;i<=4;i++)
    {
        vector<int> numseq;
        for(int j = 1;j<=4;j++)
        {
            if(j!=i)
                numseq.push_back(j);
        }
        bool numSwipeRight = true;
        for(int j = 0; j < 6;j++)
        {
            int symseq[] = {1,2,3};
            bool symSwipeRight = true;
            for(int k = 0; k<6;k++)
            {
                ans = min(ans,solve(symseq,numseq,i));
                //cout << ans << endl;
                if(symSwipeRight)
                {
                    swap(symseq[1],symseq[2]);
                    symSwipeRight = false;
                }
                else
                {
                    swap(symseq[1],symseq[0]);
                    symSwipeRight=true;
                }
            }
            if(numSwipeRight)
            {
                swap(numseq[1],numseq[2]);
                numSwipeRight=false;
            }
            else
            {
                swap(numseq[1],numseq[0]);
                numSwipeRight=true;
            }
        }
    }
    /*int symtest[] = {1,2,3};
    vector<int> numtest;
    numtest.push_back(2);
    numtest.push_back(3);
    numtest.push_back(4);
    ans = min(ans,solve(symtest,numtest,1));*/
    cout << ans << endl;

    return 0;
}