N = int(input())
f = True
ll = []
for i in range(N):
    l = list(map(int, input().split()))
    if len(l) != 1:
        f = False
    for c in l:
        ll.append(c)
    if len(ll) == 3:
        break

if not f:
    print('"assert"')
else:
    v = set()
    for i in range(2):
        for j in range(i+1,3):
            v.add(ll[i]+ll[j])
    v = list(v)
    v.sort()
    print(v[-2])