import math
n = int(input().strip())
arr = {}
for i in range(n) :
    eto = input().strip()
    if eto not in arr :
        arr[eto] = 1
    else :
        arr[eto] += 1

max_num = max(arr.values())
if max_num <= math.floor((n+1)/2) :
    print("YES")
else :
    print("NO")