import math

def main():
    N = int(input())
    etos = []
    for i in range(N):
        etos.append(input())
    #print(etos)
    ng_count = math.ceil(N/2) + 1
    #print(ng_count)
    max_count = 0
    for e in set(etos):
        #print("e", e)
        count = etos.count(e)
        #print("count", count)
        if count > max_count:
            max_count = count
    #print("max_count", max_count, "ng_count", ng_count)
    if max_count < ng_count:
        print("YES")
    else:
        print("NO")

if __name__ == '__main__':
    main()