# -*- config: utf-8 -*-


a = 0
b = 0
c = 0

a = input('>>>')
b = input('>>>')
c = input('>>>')

if a+b == c:
    j=1
if a+c == b:
    j=1
if b+c == a:
    j=1

if(j == 1):
    print 'YES'
else:
    print 'NO'

