fn main() {
    let mut nk = String::new();
    std::io::stdin().read_line(&mut nk).ok();
    let nk: Vec<usize> = nk.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nk[0];
    let k = nk[1] as isize;
    let grid = (0..2*n).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp = temp.trim();
            temp.chars().collect::<Vec<_>>()
        })
        .collect::<Vec<_>>();
    let score = (0..2*n).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp: Vec<isize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
            temp
        })
        .collect::<Vec<_>>();

    let cnts = grid.iter().map(|v| v.iter().filter(|&&c| c == '#').count()).sum::<usize>();
    let mut asynmetry = score.iter().flat_map(|v| v).copied().collect::<Vec<isize>>();
    asynmetry.sort();
    let mut result = asynmetry.iter().rev().take(cnts).sum::<isize>();
    if cnts % 2 == 1 {
        println!("{}", result);
        return;
    }
    let mut scoresum = Vec::with_capacity(2*n*n);
    for i in 0..2*n {
        for j in 0..n {
            scoresum.push(score[i][j] + score[i][2*n-1-j]);
        }
    }
    scoresum.sort();
    scoresum.reverse();
    result = result.max(scoresum.iter().take(cnts/2).sum::<isize>() + k);
    println!("{}", result);
}