#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[3];
  cin >> a[0] >> a[1] >> a[2];
  int max = a[0];
  int total = a[0] + a[1] + a[2];
  for (int i = 0; i < 3; i++) {
    if (max < a[i]) max = a[i];
  }
  if (max = total - max)
    cout << "Yes";
  else
    cout << "No";
}
