import sys
N,M,K = map(int,input().split())
lsB = list(map(str,sys.stdin.readline().split()))
f = lsB.pop(0)
lsB = [int(i) for i in lsB]
lsA = [int(input()) for i in range(N)]
lsans = [[0]*(M) for i in range(N)]
'''
if f == '*':
    sumB = sum(lsB)%K
    ans = 0
    for i in range(N):
        ans += lsA[i]*sumB
        ans %= K
    print(ans)
else:
    sumB = sum(lsB)%K
    sumA = sum(lsA)%K
    sumB *= N
    sumB %= K
    sumA *= M
    sumA %= K
    print((sumA+sumB)%K)
'''