#include <cassert>
#include <cmath>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <limits.h>
#include <map>
#include <queue>
#include <set>
#include <string.h>
#include <vector>

using namespace std;
typedef long long ll;

const ll MOD = 1000000007;
ll dp[310][310 * 310];

int main() {
  int N, D, K;
  cin >> N >> D >> K;
  memset(dp, 0, sizeof(dp));
  dp[0][1] = 1;
  dp[0][D + 1] = -1;

  for (int i = 0; i < N - 1; ++i) {
    ll sum = 0;
    ll rui = 0;

    for (int j = 0; j < D * N; ++j) {
      rui = (rui + dp[i][j]) % MOD;
      dp[i + 1][j + 1] = (dp[i + 1][j + 1] + rui) % MOD;
      if (j + D + 1 <= D * N) dp[i + 1][j + D + 1] = (dp[i + 1][j + D + 1] - rui) % MOD;
    }
  }

  ll ans = 0;
  ll rui = 0;

  for (int j = 0; j <= K; ++j) {
    rui = (rui + dp[N - 1][j]) % MOD;
    ans = (ans + rui) % MOD;
  }

  cout << rui << endl;

  return 0;
}