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