use proconio::input;

fn main() {
    input! {
        h: usize, w: usize,
        a: [[u8; w]; h],
    }

    let mut cnt_row = vec![0; h];
    let mut cnt_col = vec![0; w];
    for i in 0..h {
        for j in 0..w {
            cnt_row[i] ^= a[i][j];
            cnt_col[j] ^= a[i][j];
        }
    }

    let x = cnt_row.iter().filter(|&&x| x == 1).count();
    let y = cnt_col.iter().filter(|&&x| x == 1).count();
    let ans = x.max(y);
    println!("{ans}");
}