N = int(input())
A = [ [0]*N for _ in range(N) ]
for i in range(N):
    A[i] = list(map(int,input().split(" ")))
    if len(A[i]) == 3:
        print("\"assert\"")
        exit(0)
print(sorted(list(set([ A[0][0]+A[1][0],A[0][0]+A[2][0],A[1][0]+A[2][0] ])) )[-2])