#include <bits/stdc++.h>
using namespace std;

int main() {
  int N, D, K; {
    cin >> N >> D >> K;
  }

  const int M = 1e9 + 7;

  vector<int> d(K + 1); {
    d[0] = 1;
    for (int i = 0; i < N; ++i) {
      vector<int> nd(K + 1); {
        int spd = d[0];
        for (int j = 1; j <= K; ++j) {
          if (j - D - 1 >= 0) (spd -= d[j - D - 1]) %= M;
          nd[j] = spd;
          (spd += d[j]) %= M;
        }
      }
      swap(d, nd);
    }
  }

  int res = d[K]; {
    if (res < 0) res += M;
  }

  cout << res << endl;
}