from itertools import product

def f(X,m):
    result = 0
    for element in X:
        result += element**2
    return result%m
    
    
def get_max_combo():
    num_lists, m = map(int, input().split()) # Read
    lists = [] # initialize where to save in the lists
    # save lists from input into lists
    for i in range(num_lists): 
        num_elements, *elements = map(int, input().split())
        lists.append(elements)
    # create combinations of every possible list entry with entries from other list entries 
    combos = list(product(*lists))
    max_f = 0
    for combo in combos:
        current_max = f(combo, m)
        if current_max > max_f:
            max_f = current_max
    print(max_f)
    
    
get_max_combo()