t(input())
l=[sorted(list(map(int,input().split()))) for i in range(n)]
l.sort(key=lambda x:x[1],reverse=True)
x=[]
for i in l:
    x+=i
x.sort()
xi=dict()
xin=dict()
for i,j in enumerate(x):
    xi[j]=i
    xin[i]=j
dp=[[0]*(n*3+1) for i in range(n*3+1)]
def dpi(a,b,c):
    return max([max(i[xi[b]+1:]) for i in dp[:xi[a]+1]]+[max(i) for i in dp[xi[a]+1:]])+c
def f(a,b,c):
    dp[a][b],dp[a][c],dp[b][c]=dpi(a,b,c),dpi(a,c,b),dpi(b,c,a)
for a,b,c in l:
    f(a,b,c)
print(max([max(i) for i in dp]))