#include <bits/stdc++.h>
int main() {
  int a, b, c;
  scanf("%d%d%d", &a, &b, &c);
  int maxVal = ((((a) > (b) ? (a) : (b))) > (((b) > (c) ? (b) : (c)))
                    ? (((a) > (b) ? (a) : (b)))
                    : (((b) > (c) ? (b) : (c))));
  if (maxVal == a) {
    if (maxVal - b == c)
      printf("YES");
    else
      printf("NO");
  } else if (maxVal == b) {
    if (maxVal - a == c)
      printf("YES");
    else
      printf("NO");
  } else if (maxVal == c) {
    if (maxVal - b == a)
      printf("YES");
    else
      printf("NO");
  } else
    printf("NO");
  putchar(10);
  fflush(stdout);
}
