#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
using PL = pair<ll, ll>;
// Welcome to my source code!

const int MOD = 1000000007;
const int MAX_V = 90000;
const int MAX_N = 300;

ll dp[MAX_N + 1][MAX_V + 1];

int main() {
    ll n, d, k;
    cin >> n >> d >> k;
    dp[0][0] = 1;
    for (int i = 0; i < n; i++) {
        for (int j = i + 1; j <= MAX_V; j++) {
            dp[i + 1][j] += dp[i][j - 1];
            if (j - d - 1 >= 0) dp[i + 1][j] -= dp[i][j - d - 1];
            dp[i + 1][j] += dp[i + 1][j - 1];
            dp[i + 1][j] %= MOD;
        }
    }
    cout << dp[n][k] << endl;
}