#include <bits/stdc++.h>
using namespace std;
int a[100005];
int main() {
  int a, b, c;
  while (~scanf("%d%d%d", &a, &b, &c)) {
    if (a + b == c || a + c == b || b + c == a)
      printf("YES\n");
    else
      printf("NO\n");
  }
  return 0;
}
