from itertools import product

num,num1=input().split()

list1=[]

for i in range(int(num)):

k,*list_value=list(map(int,input().split()))

list1.append(list_value)

max_value=0

for cury in product(*list1):

tatal_val=sum(x**2 for x in cury)%int(num1)

max_value=max(max_value,tatal_val) 

print(max_value)