import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int d = sc.nextInt();
        int k = sc.nextInt();
        int[][] dp = new int[n + 1][k + 2];
        Arrays.fill(dp[0], 1);
        dp[0][0] = 0;
        for (int i = 1; i <= n; i++) {
            for (int j = 2; j <= k + 1; j++) {
                dp[i][j] = ((dp[i][j - 1] + dp[i - 1][j - 1]) % MOD - dp[i - 1][Math.max(0, j - d - 1)] + MOD) % MOD;
            }
        }
        System.out.println((dp[n][k + 1] - dp[n][k] + MOD) % MOD);
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}