n=int(input())
if n%2==0:
    mc=n//2
else:
    mc=n//2+1
sls=[]
lsc=[]
for i in range(n):
    sls.append(input())
for i in range(len(sls)):
    lsc.append(sls.count(sls[i]))
dist=max(lsc)
if dist <= mc:
    print("YES")
else:
    print("NO")