Did I misunderstood the problem??

# Enter your code here. Read input from STDIN. Print output to STDOUT
k,m=map(int, input().split(" "))
li=[]
for i in range(1,k+1):
    li.append((max(list(map(int, input().split()))))**2)
print(sum(li)%m)

What I did here is I took the max element out of all k lists provided, summed up the square value of the element(s) and as said applied modular with m. Am I missing something? Please explain if I misunderstood the problem. Thx.