from collections import defaultdict
N, X = map(int, input().split())
A = list(map(int, input().split()))

dd = defaultdict(int)
for a in A:
    dd[a] += 1

ans = 0 
for k, v in dd.items():
    partner = X - k
    if partner in dd:
        ans += v*dd[partner]

print(ans)