fn main() {
    let mut sc = Scanner::new(std::io::stdin().lock(), 11111);
    let n: usize = sc.next();
    let s: Vec<Vec<char>> = (0..n)
        .map(|_n| sc.next::<String>().chars().collect::<Vec<char>>())
        .collect();

    let ans = solve(n, s);
    println!("{ans}");
}

fn solve(n: usize, s: Vec<Vec<char>>) -> usize {
    let mut cnt = 0;
    // vertical
    for ln in &s {
        if is_reach(ln) {
            cnt += 1;
        }
    }
    // horizotal
    for i in 0..n {
        let ln: Vec<char> = s.iter().map(|v| v[i]).collect();
        if is_reach(&ln) {
            cnt += 1;
        }
    }
    // diagonal
    {
        let ln1: Vec<char> = (0..n).map(|i| s[i][i]).collect();
        if is_reach(&ln1) {
            cnt += 1;
        }
        let ln2: Vec<char> = (0..n).map(|i| s[i][s.len() - 1 - i]).collect();
        if is_reach(&ln2) {
            cnt += 1;
        }
    }
    cnt
}

fn is_reach(ln: &[char]) -> bool {
    ln.iter().filter(|&&c| c == '.').count() == 1 && !ln.contains(&'B')
}

struct Scanner<R: std::io::BufRead> {
    reader: R,
    buf: Vec<u8>,
    pos: usize,
}
impl<R: std::io::BufRead> Scanner<R> {
    fn new(reader: R, capacity: usize) -> Self {
        Scanner {
            reader,
            buf: Vec::with_capacity(capacity),
            pos: 0,
        }
    }
    fn next<T: std::str::FromStr>(&mut self) -> T
    where
        T::Err: std::fmt::Debug,
    {
        if self.buf.is_empty() {
            self.read_next_line();
        }
        let mut start = None;
        loop {
            if self.pos == self.buf.len() {
                break;
            }
            match (self.buf[self.pos], start.is_some()) {
                (b' ', true) | (b'\n', true) => break,
                (_, true) | (b' ', false) => self.pos += 1,
                (b'\n', false) => self.read_next_line(),
                (_, false) => start = Some(self.pos),
            }
        }
        let elem = unsafe { std::str::from_utf8_unchecked(&self.buf[start.unwrap()..self.pos]) };
        elem.parse()
            .unwrap_or_else(|_| panic!("{}", format!("failed parsing: {}", elem)))
    }
    fn read_next_line(&mut self) {
        self.pos = 0;
        self.buf.clear();
        if self.reader.read_until(b'\n', &mut self.buf).unwrap() == 0 {
            panic!("Reached EOF");
        }
    }
}