N = int(input())
D = {}
for i in range(N) :
    a = input()
    if a not in D :
        D[a] = 1
    else :
        D[a] += 1

MAX = 0
for k in D :
    MAX = max(MAX, D[k])

c = 0

if list(D.values()).count(MAX) > 1 :
    print("YES")
else :

    for k in D :
        if D[k] != MAX :
            c += D[k]

    if c < MAX-1 :
        print("NO")
    else :
        print("YES")