#include <bits/stdc++.h>
using namespace std;
const double PI = acos(-1.0);
const double eps = 1e-6;
const int INF = 0x3f3f3f3f;
int main() {
  int a, b, c;
  scanf("%d %d %d", &a, &b, &c);
  if (a + b != c)
    printf("No\n");
  else {
    printf("Yes\n");
  }
  return 0;
}
