from functools import cache

n = int(input())
# fw_ind = [[] for _ in range(n)]
bw_ind = [-1] * n
mx, mx_ind = -1, -1
for _ in range(n-1):
    a, f = map(int, input().split())
    # fw_ind[a-1].append(f-1)
    bw_ind[f-1] = a-1


@cache
def calc_dist(node):
    if bw_ind[node] == -1:
        return 1
    else:
        return 1 + calc_dist(bw_ind[node])

for i in range(n):
    c = calc_dist(i)
    if c > mx:
        mx = c
        mx_ind = i + 1

print(mx_ind)