x = [list(map(str, input().split()))]
m1, m2 = int(x[0][0]), int(x[0][1])
x = [list(map(int, input().split())) for _ in range(m1)]
for z in x:
    z.pop(0)
pools = list(map(tuple, x))
elements = [[]]
for pool in pools:
    elements = [x+[y] for x in elements for y in pool]

S = list([sum(j**2 for j in i) for i in elements])
Smax = [i%m2 for i in S]
print(max(Smax))