from functools import reduce
def evaluate(arr):
    sq = list(map(lambda x : x**2, arr))
    sum_1 = reduce(lambda x, y :x+y, sq )
    return sum_1

s = list(map(int, input().split()))
count_arr = s[0]
M = s[1]
Sum = 0
all_arr = []
for _ in range(count_arr):
    arr = list(map(int, input().split()))
    all_arr.append(arr[1:])
combinations = list(product(*all_arr)) 
result = []
for comb in combinations:
    result.append(evaluate(list(comb))%M)

print(max(result))