Number 2

n = int(input())
a = ['None']*n
a = input().split(' ')
x = int(input())
min = abs(x - int(a[0]))
ind_min = 0
for i in range(1,n):
	if abs(x - int(a[i])) < min:
		min = abs(x - int(a[i]))
		ind_min = i
print(a[ind_min])