#include <bits/stdc++.h>

#define F first
#define S second
#define MP make_pair
#define pb push_back
#define all(a) a.begin(), a.end()
#define lcm(a, b) (a)/__gcd((a),(b))*(b)
#define CEIL(a, b) (a)/(b)+(((a)%(b))?1:0)
#define endl '\n'

using namespace std;

typedef long long LL;
typedef pair<int, int> P;
typedef pair<LL, LL> LP;

static const int INF = INT_MAX;
static const LL LINF = LLONG_MAX;
static const int MIN = INT_MIN;
static const LL LMIN = LLONG_MIN;
static const int MOD = 1000000007;
static const int SIZE = 200005;

const int dx[] = {0, -1, 1, 0};
const int dy[] = {-1, 0, 0, 1};

vector<int> Div(int n) {
    vector<int> ret;
    for(int i = 1; i * i <= n; ++i) {
        if(n % i == 0) {
            ret.pb(i);

            if(i * i != n) ret.pb(n / i);
        }
    }
    sort(all(ret));
    return ret;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n, d, k;
    cin >> n >> d >> k;
    LL dp[n + 1][k + 1] = {};
    dp[0][0] = 1;

    for(int i = 1; i <= d; ++i) {
        dp[1][i] = 1;

    }
    for(int i = 2; i <= n; ++i) {
        for(int j = 1; j <= k; ++j) {
            dp[i][j] = dp[i - 1][j - 1];
            dp[i][j] += dp[i][j - 1];
            if(j - d - 1 > 0) {
                dp[i][j] -= dp[i - 1][j - d - 1];

            }
            dp[i][j] %= MOD;

        }
    }
    /*
    for(int i = 1; i <= n; ++i) {
        for(int j = 1; j <= k; ++j) {
            cout << dp[i][j] << " ";

        }
        cout << endl;
    }
    */
    cout << dp[n][k] << endl;

    return 0;
}