use std::collections::{HashSet, VecDeque};

fn main() {
    let (n, k) = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        let mut iter = line.split_whitespace();
        (
            iter.next().unwrap().parse::<usize>().unwrap(),
            iter.next().unwrap().parse::<usize>().unwrap(),
        )
    };
    let mut ccc: Vec<Vec<char>> = vec![];
    for _ in 0..n {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        ccc.push(line.trim().chars().collect());
    }

    let sss: Vec<Vec<usize>> = ccc
        .iter()
        .map(|cc| cc.iter().map(|&c| (c as u8 - b'0') as usize).collect())
        .collect();

    let set: HashSet<Vec<usize>> = sss.iter().cloned().collect();
    let mut covered_set = HashSet::new();
    let mut visited = HashSet::new();

    let create_next_nodes = |cur_node: &Vec<usize>| {
        (0..k)
            .filter(|&i| cur_node[i] != 0)
            .map(|i| {
                let mut next_node = cur_node.clone();
                next_node[i] -= 1;

                next_node
            })
            .collect::<Vec<Vec<usize>>>()
    };

    for ss in &sss {
        if visited.contains(ss) {
            continue;
        }

        let mut que = VecDeque::from(vec![ss.clone()]);
        visited.insert(ss.clone());

        while let Some(cur_node) = que.pop_front() {
            for next_node in create_next_nodes(&cur_node) {
                if set.contains(&next_node) {
                    covered_set.insert(next_node.clone());
                }

                if !visited.contains(&next_node) {
                    que.push_back(next_node.clone());
                    visited.insert(next_node);
                }
            }
        }
    }

    println!("{}", covered_set.len());
}