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