#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import collections


def repeatedly_subtract(x, ls):
    assert x <= sum(ls)
    while x > 0:
        if x < ls[-1]:
            ls[-1] -= x
            break
        else:
            x -= ls[-1]
            _ = ls.pop()


def solve(n, ornaments):
    counter = collections.Counter(ornaments)
    numbers = sorted(counter.values())
    while numbers:
        max_n = numbers.pop()
        if max_n > sum(numbers) + 1:
            return False
        if not numbers:
            return True
        repeatedly_subtract(max_n - 1, numbers)


def main():
    n = int(input())
    ornaments = [input() for _ in range(n)]
    if solve(n, ornaments):
        print("YES")
    else:
        print("NO")


if __name__ == '__main__':
    main()