n = int(input())
table = ['']
for i in range(n-1):
    table.append(input().split(' '))
a = input()
a, b = a.split(' ')
a = int(a)
b = int(b)
cost = int(table[b][a])
res = a
for i in range(1, n):
    if i != a and i != b:
        if int(table[i][a]) + int(table[i][b]) < cost:
            res = i
            cost = int(table[i][a]) + int(table[i][b])
print(res)