import collections
N,M = map(int, input().split())
A = list(map(int, input().split())) 
C = collections.Counter()
for a in A:
    C[a%M]+=1
ans = 0
for k,v in C.items():
    ans+=v*C[M/2+k]*(N-C[k]-C[M/2+k])
print(ans)