import bisect
import sys
input = sys.stdin.readline


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

    ans = 0
    for i in range(N):
        r = bisect.bisect_right(A, X-A[i])
        l = bisect.bisect_left(A, X-A[i])
        ans += r - l
    
    print(ans)


if __name__ == '__main__':
    main()