import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        long[][] dp = new long[4][1 << 6];
        for (int i = 0; i < n; i++) {
            int[] scores = new int[6];
            for (int j = 0; j < 6; j++) {
                scores[j] = sc.nextInt();
            }
            for (int j = 1; j < (1 << 6); j++) {
                long tmp = 1;
                for (int k = 0; k < 6; k++) {
                    if ((j & (1 << k)) == 0) {
                        continue;
                    }
                    tmp *= scores[k];
                }
                dp[0][j] = Math.max(dp[0][j], tmp);
            }
        }
        for (int i = 1; i < 4; i++) {
            for (int j = 1; j < (1 << 6); j++) {
                if (getPop(j) <= i) {
                    continue;
                }
                dp[i][j] = dp[i - 1][j];
                for (int k = ((j - 1) & j); k > 0; k = ((k - 1) & j)) {
                    dp[i][j] = Math.max(dp[i][j], dp[i - 1][k] * dp[0][j ^ k]);
                }
            }
        }
        System.out.println(dp[3][(1 << 6) - 1]);
    }
    
    static int getPop(int x) {
        int pop = 0;
        while (x > 0) {
            pop += x % 2;
            x >>= 1;
        }
        return pop;
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}