mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N = int(input())
    xyz = []
    for _ in range(N):
        a, b, c = map(int, input().split())
        xyz.append(sorted([a, b, c]) + [0])

    if N == 1:
        print(max(xyz[0]))
        exit()

    while True:
        xyz.sort(key= lambda p: p[1], reverse=True)
        ok = 1
        for i in range(N-1):
            if xyz[i+1][0] > xyz[i][0]:
                ok = 0
                x, y, z, w = xyz[i+1]
                if w == 0:
                    xyz[i+1] = [x, z, y, 1]
                elif w == 1:
                    xyz[i+1] = [y, z, x, 2]
                else:
                    assert False
        if ok:
            ans = 0
            for i in range(N):
                ans += xyz[i][2]
            break
    print(ans)


if __name__ == '__main__':
    main()