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