#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  if (a + b < c || b + c < a || a + c < b) {
    cout << "No";
  } else if (a == b == c) {
    cout << "No";
  } else
    cout << "Yes";
  return 0;
}
