n = int(input())
a = list(map(int, input().split()))
b = set(a)
d = [0,0,0]
index = 0
if len(b) != 3 and n % 3 != 0:
    print("No")
    exit()
for i in list(b):
    for j in a:
        if i == j:
            d[index] += 1
    index += 1
if d[0] == d[1] and d[1] == d[2]:
    print("Yes")
else:
    print("No")