// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------

fn run() {
    const M: usize = 6;
    input! {
        n: usize,
        p: [[u64; M]; n],
    }
    let mut dp = [[1u64; 1 << M]; 5];
    for p in p {
        let mut mul = [1; 1 << M];
        for (i, p) in p.iter().enumerate() {
            for j in 0..(1 << i) {
                mul[j + (1 << i)] = mul[j] * *p;
            }
        }
        for i in (0..4).rev() {
            for x in 0..(1 << M) {
                let mut y = x;
                while y > 0 {
                    dp[i + 1][x] = dp[i + 1][x].max(mul[y] * dp[i][x ^ y]);
                    y = (y - 1) & x;
                }
            }
        }
    }
    let ans = *dp.iter().flatten().max().unwrap();
    println!("{}", ans);
}

fn main() {
    run();
}