N = int(input())
cards = []
for _ in range(N):
    A, B, C = map(int, input().split())
    cards.append((A, B, C))


dp = [(-1, 0, 0)]
for i in range(N):
    pp = []
    dp, pp = pp, dp
    for s, x, tot in pp:
        for j in range(3):
            if s == j: continue
            nx = x + cards[i][j]
            ntot = tot + nx
            dp.append((j, max(0, nx-1), ntot))

ans = max(tot for _, _, tot in dp)
print(ans)