from bisect import bisect, bisect_left
from sys import stdin, stdout
input = lambda: stdin.readline().rstrip()
write = stdout.write

def main():
    N, X = map(int, input().split())
    A = list(map(int, input().split()))

    A.sort()
    ans = 0
    for ai in A:
        aj = X - ai
        i = bisect_left(A, aj)
        j = bisect(A, aj)
        ans += j - i
    print(ans)

main()