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