from itertools import product

K,M=input().split()
def fx(l1):
    l2=list(map(lambda x:x**2,l1))
    return(sum(l2)%int(M))

lists= [ list(map(int,input().split()))[1:] for _ in range(int(K))]
combos=list(product(*lists))
S_max=0
for comb in combos:
    value=fx(comb)
    if value>S_max:
        S_max=value
print(S_max)