def list_map(func, xs: list) -> list: return list(map(func, xs))
def input_str()      -> str:   return input().strip()
def input_int()      -> int:   return int(input().strip())
def input_list()     -> [str]: return input().strip().split()
def input_int_list() -> [int]: return list_map(int, input_list())

def main():
    n = input_int()
    d = {}
    ok = True
    for i in range(n):
        s = input_str()
        d.setdefault(s, 0)
        d[s] += 1
        if d[s] >= (n/2+1):
            ok = False
            break
    print('YES' if ok else 'NO')

if __name__ == '__main__':
    main()