#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<iostream>
#include<vector>
using namespace std;
using i32 = int_fast32_t;
using i64 = int_fast64_t;
#define rep(i, n) for (i32 i = 0; i < (i32)(n); i++)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
using P = pair<i64,i64>;
constexpr i64 MAX = 10000000;
constexpr i64 MOD = 1000000007;

int main(){
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    i64 n,d,k;
    cin >> n >> d >> k;
    vector<vector<i64>> dp(n + 1,vector<i64> (k + 1,0));
    dp[0][0] = 1;
    rep(i,n) {
        rep(j,k + 1){
            if(j + 1 <= k){
                dp[i + 1][j + 1] += dp[i][j];
                dp[i + 1][min(j + d + 1, k + 1)] -= dp[i][j];
            }
        }
        rep(j,k + 1){
            dp[i + 1][j + 1] += dp[i + 1][j];
        }
    }
    cout << dp[n][k] % MOD << endl;
}