def main():
    N = int(input())
    T = tuple(input() for _ in [0] * N)

    eto = dict()
    for t in T:
        eto[t] = eto.get(t, 0) + 1

    x = (len(T) + 1) // 2 + 1
    maxv = max(eto.values())
    if maxv >= x:
        print('NO')
    else:
        print('YES')

main()