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