#include <bits/stdc++.h>
using namespace std;
int main() {
  int t, s, x;
  cin >> t >> s >> x;
  int tmp = x - t;
  if ((tmp % s == 0 || tmp % s == 1) && tmp >= 0 && tmp != 1)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
