#![allow(unused_imports, dead_code, unused_macros, unused_variables, non_snake_case, unused_parens)]
use std::cmp::{min,max,Ordering,Reverse};
use std::mem::swap;
use std::collections::{VecDeque,LinkedList,HashMap,BTreeMap,HashSet,BTreeSet,BinaryHeap};



fn main() {
	let (n, m): (i64,i64) = {
		let mut line: String = String::new();
		std::io::stdin().read_line(&mut line).unwrap();
		let mut iter = line.split_whitespace();
		(
			iter.next().unwrap().parse().unwrap(),
			iter.next().unwrap().parse().unwrap()
		)
	};
	let A: Vec<i64> = {
		let mut line: String = String::new();
		std::io::stdin().read_line(&mut line).unwrap();
		line.split_whitespace()
			.map(|x| x.parse().unwrap())
			.collect()
	};
	if m%2==1 {
		println!("0");
		return;
	}
	let b = A.iter().map(|&a| a.rem_euclid(m)).collect::<HashSet<_>>();
	let mut ans = 0;
	let h = m>>1;
	for a in A.iter() {
		if b.contains(&((a+h).rem_euclid(m))) {
			ans += n-2;
		}
	}
	println!("{}", ans>>1);

}