n=int(input())
tip=0

colvo=0
g=[]
for i in range(0,n):
	m=input()
	g.append(m)
g.sort()
for j in g:
	if g.count(j)==1:
		g.remove(j)
z=g[0]
for ij in range (1,len(g)):
	if z==g[ij]:
		tip+=1
	else:
		z=g[ij]
colvo=len(g)-(tip*2-1)
print(tip)