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