f = open('27-25b.txt')
N = int(f.readline())
firstpair = list(map(int, f.readline().split()))
for i in range(N-1):
    nextpair = list(map(int, f.readline().split()))
    combs = sorted([a+b for a in firstpair for b in nextpair])
    ost = [0]*8
    for x in combs:
        ost[x%8] = max(ost[x%8], x)
    firstpair = ost


print(firstpair[3])