#include <bits/stdc++.h>
int main() {
  int a, b, c, flag = 0;
  scanf("%d %d %d\n", &a, &b, &c);
  if ((a + b) == c) flag = 1;
  if ((b + c) == a) flag = 1;
  if ((a + c) == b) flag = 1;
  if (flag == 1) printf("YES\n");
  if (flag == 0) printf("NO\n");
  return 0;
}
