using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics.X86;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, d, k) = (c[0], c[1], c[2]);
        var dp = new long[k + 2];
        var mod = 1_000_000_007;
        dp[0] = 1;
        for (var t = 0; t < n; ++t)
        {
            var ndp = new long[k + 2];
            for (var i = 0; i < k; ++i)
            {
                ndp[i + 1] = (ndp[i + 1] + dp[i]) % mod;
                var end = Math.Min(k + 1, i + d + 1);
                ndp[end] = (ndp[end] - dp[i] + mod) % mod;
            }
            for (var j = 1; j < ndp.Length; ++j) ndp[j] = (ndp[j] + ndp[j - 1]) % mod;
            dp = ndp;
        }
        WriteLine(dp[k]);
    }
}