use std::collections::BTreeMap;


fn main() {
    let mut nm = String::new();
    std::io::stdin().read_line(&mut nm).ok();
    let nm: Vec<usize> = nm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nm[0];
    let m = nm[1];
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    if m == 1 {
        println!("1");
        return;
    }
    let mut mapping = BTreeMap::new();
    for &v in a.iter() {
        *mapping.entry(v%m).or_insert(0usize) += 1;
    }
    let mut result = 0usize;
    for (&key, cnt) in mapping.iter() {
        let other = (m - key) % m;
        if other == key {
            result += 1;
            continue;
        }
        if other < key && mapping.contains_key(&other) {
            continue;
        }
        let othercnt = *mapping.get(&other).unwrap_or(&0usize);
        result += cnt.max(&othercnt);
    }
    println!("{}", result);
}