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 i in range(M//2):
    ans+=C[i]*C[M/2+i]*(N-C[i]-C[M/2+i])
print(ans)