Divisible_Sum_Pairs.py

#!/bin/python

import sys


n,k = raw_input().strip().split(' ')
n,k = [int(n),int(k)]
a = map(int,raw_input().strip().split(' '))
c = 0
for i in range(n-1):
    for j in range(i+1,n):
        if (a[i]+a[j]) % k == 0:
            c += 1
print c