def solve(lines):
    _, X = int(lines[0].split(" ")[0]), int(lines[0].split(" ")[1])
    a = [int(a) for a in lines[1].split(" ")]
    comps = {}
    count = 0
    for ai in a:
        if X - ai not in comps:
            comps[X - ai] = 0
        comps[X - ai] += 1

    for ai in a:
        if ai in comps:
              count += comps[ai]

    return count

if __name__ == "__main__":
    print(solve([input(), input()]))