n = int(input())
dp = [[(0, 0)], [(0, 0)], [(0, 0)]]
# power = 0, deal_damage = 0

for turn in range(n):
    a = list(map(int, input().split()))
    pre = [[], [], []]
    for i in range(3):
        for s, c in dp[i]:
            power = s + a[i]
            for j in range(3):
                if i == j: continue
                pre[j].append((max(0, power - 1), c + power))
    
    nxt = [[], [], []]
    
    # s1, c1 : s2, c2
    # 
    for i in range(3):
        for p in range(len(pre[i])):
            add = True
            for q in range(len(pre[i])):
                if p == q: continue
                s1, c1 = pre[i][p]
                s2, c2 = pre[i][q]
                if p >= q and s1 == s2 and c1 == c2: add = False
                if (s2 - s1) > (c1 - c2) * (n - turn): add = False
            if add: nxt[i].append(pre[i][p])
    
    dp = nxt[::]

ans = 0
for i in range(3):
    for p, c in dp[i]:
        ans = max(ans, c)

print(ans)