n = int(input())
dp = [[(0, 0)] for _ in range(3)]
for _ in range(n):
    ndp = [[] for _ in range(3)]
    A = list(map(int, input().split()))
    for i in range(3):
        for j in range(3):
            if i == j:
                continue
            for pow, dam in dp[i]:
                ndp[j].append((max(0, pow + A[j] - 1), dam + pow + A[j]))

    for i in range(3):
        ndp[i].sort(key=lambda x: -x[0])
        dp[i] = [ndp[i][0]]
        for j in range(1, len(ndp[i])):
            if ndp[i][j][1] > dp[i][0][1]:
                dp[i].append(ndp[i][j])

ans = 0
for i in range(3):
    for pow, dam in dp[i]:
        ans = max(ans, dam)
print(ans)