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