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

    const int N = 1e5+10;

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

    bool cmp(int i,int j)
    {
        return i<j;
    }

    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


        for(int i=0;i<4;i++)
            cin>>arr[i];
        for(int i=0;i<3;i++)
            cin>>op[i];
        sort(arr,arr+4);
        sort(op,op+3,cmp);
        for(int i=0;i<3;i++)
        {
            if(op[i]=='*')
                arr[i+1]=arr[i]*arr[i+1];
            else
                arr[i+1]=arr[i]+arr[i+1];
            sort(arr,arr+4);
        }
        cout<<arr[3];
        //cout << ans;
        return 0;
    }