n = int(input())
dic = {}

for _ in range(n):
    s = input()
    if s in dic:
        dic[s] += 1
    else:
        dic[s] = 1
    
mx = 0
for v in dic.values():
    mx = max(mx, v)
    
if mx - 1 <= n - mx:
    print('YES')
else:
    print('NO')