from heapq import heappush, heappop

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
    q1 = []
    q2 = []
    for prev_j, x, tot in pp:
        for j in range(3):
            if prev_j == j: continue
            nx = x + cards[i][j]
            ntot = tot + nx
            # dp.append((j, max(0, nx-1), ntot))
            heappush(q1, (max(0, nx-1), ntot, j))
            heappush(q2, (ntot, max(0, nx-1), j))

            if len(q1) > 50: heappop(q1)
            if len(q2) > 50: heappop(q2)

    for nx, ntot, j in q1:
        dp.append((j, nx, ntot))

    for ntot, nx, j in q2:
        dp.append((j, nx, ntot))


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