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<<lst[0]^1<<lst[i])+F[lst[0]][lst[i]])
    return m
ans=main((1<<N)-1)
print(ans)