#include "bits/stdc++.h"

using namespace std;

vector <int> otv;

int q(int v){
    int qq = 0;
    while (v != 0){
        int cf = v%10;
        if (cf%2==0){
            qq++;
        }
        v = v/10;
    }
    return qq;
}

int q2(int v){
    int qq = 1;
    while (v != 0){
        int cf = v%10;
        if (cf%2==0){
            qq*=cf;
        }
        v = v/10;
    }
    return qq;
}


int z[5];

int main()
{
    int a,b,c;
    cin >> a >> b >> c;
    if (q(a)!=0 || q(b)!=0 || q(c)!=0){
        z[0] = a+b;
        z[1] = a+c;
        z[2] = b+c;
        int maxx = 0;
        int zz = 0;
        for (int i = 0; i < 3; i++){
            if (q(z[i]) > maxx){
                maxx = q(z[i]);
                zz = i;
                otv.clear();
                otv.push_back(q2(z[i]));
            } else if(q(z[i]) == maxx){
                otv.push_back(q2(z[i]));
            }
        }
        sort(otv.begin(),otv.end());
        cout << otv[0];
    } else {
        cout << 0;
    }
    return 0;
}