#![allow(unused_imports)]
//use itertools::{iproduct, Itertools};
//use proconio::input;
//use proconio::marker::*;
use std::collections::*;

fn main() {
    input! {
        h:usize,
        w:usize,
        a:[chars;h],
    }

    let ans = dfs(0, 0, 1, &a, h, w);
    println!("{}", ans);
}

fn dfs(px: usize, py: usize, cnt: usize, a: &Vec<Vec<char>>, h: usize, w: usize) -> usize {
    if px == h - 1 && py == w - 1 {
        return 1;
    }

    let mut res = 0;
    if px < h - 1 {
        match a[px + 1][py] {
            'o' => res = res + dfs(px + 1, py, cnt + 1, a, h, w),
            'x' if 0 < cnt => res = res + dfs(px + 1, py, cnt - 1, a, h, w),
            _ => (),
        }
    }

    if py < w - 1 {
        match a[px][py + 1] {
            'o' => res = res + dfs(px, py + 1, cnt + 1, a, h, w),
            'x' if 0 < cnt => res = res + dfs(px, py + 1, cnt - 1, a, h, w),
            _ => (),
        }
    }

    res
}

use input::*;
mod input {
    #[macro_export]
    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_export]
    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_export]
    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>>()
        };

        ($iter:expr, usize1) => {
            read_value!($iter, usize) - 1
        };

        ($iter:expr, $t:ty) => {
            $iter.next().unwrap().parse::<$t>().expect("Parse error")
        };
    }
}