#include "bits/stdc++.h"
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;

typedef long long ll;

int main() {
    ll N, d, K, MOD =1e9 + 7;
    cin >> N >> d >> K;
    //dp[i][j] : i回の移動でj段目にたどり着く方法
    vector<vector<ll>> dp(N + 1, vector<ll>(K + 1, 0));
    dp[0][0] = 1;
    rep(i, N) {
        rep(j, K) {
            rep(k, d) {
                if (j + k + 1 > K) break;
                dp[i + 1][j + k + 1] += dp[i][j];
                dp[i + 1][j + k + 1] %= MOD;
            }
        }
    }
    cout << dp[N][K] << "\n";
}