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