import bisect import copy import decimal import fractions import heapq import itertools import math import random import sys from collections import Counter,deque,defaultdict from functools import lru_cache,reduce from heapq import heappush,heappop,heapify,heappushpop,_heappop_max,_heapify_max def _heappush_max(heap,item): heap.append(item) heapq._siftdown_max(heap, 0, len(heap)-1) def _heappushpop_max(heap, item): if heap and item < heap[0]: item, heap[0] = heap[0], item heapq._siftup_max(heap, 0) return item from math import gcd as GCD read=sys.stdin.read readline=sys.stdin.readline readlines=sys.stdin.readlines N=int(readline()) F=[list(map(int,readline().split())) for i in range(N)] @lru_cache(maxsize=None) def main(bit): if bit==0: return 0 lst=[i for i in range(N) if bit>>i&1] l=len(lst) m=0 for i in range(1,l): m=max(m,main(bit^1<