Ответсообщение недоступно
num = int(input())
a = num // 100
b = num // 10 % 10
c = num % 10
if a > b and a > c:
max_n = a
if b > c:
mid_n = b
min_n = c
else:
mid_n = c
min_n = b
if b > a and b > c:
max_n = b
if a > c:
mid_n = a
min_n = c
else:
mid_n = c
min_n = a
if c > b and c > a:
max_n = c
if b > a:
mid_n = b
min_n = a
else:
mid_n = a
min_n = b
summ = min_n + max_n
mult = mid_n * 2
if summ == mult:
print('YES')
else:
print('NO')