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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        long[][] dp = new long[3][1 << 6];
        for (int i = 0; i < n; i++) {
            int[] values = new int[6];
            for (int j = 0; j < 6; j++) {
                values[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 *= values[k];
                }
                dp[0][j] = Math.max(dp[0][j], tmp);
            }
        }
        for (int i = 1; i < 3; i++) {
            for (int j = 1; j < (1 << 6); j++) {
                for (int k = j; k > 0; k = ((k - 1) & j)) {
                    dp[i][j] = Math.max(dp[i][j], dp[i - 1][k] * dp[i - 1][j ^ k]);
                }
            }
        }
        System.out.println(dp[2][(1 << 6) - 1]);
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    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 int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}