import java.util.*;

public class Main {
    static final int BASE = 400;
    static final int MOD = 1000000007;
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int d = sc.nextInt();
		int k = sc.nextInt();
		int[][] dp = new int[n + 1][k + BASE + 1];
		dp[0][BASE] = 1;
		for (int i = 1; i <= k; i++) {
		    for (int j = 1; j <= n && j <= i; j++) {
		        dp[j][i + BASE] = ((dp[j][i - 1 + BASE] + dp[j - 1][i - 1 + BASE]) % MOD - dp[j - 1][i - 1 - d + BASE] + MOD) % MOD;
		    }
		}
		System.out.println(dp[n][k + BASE]);
   }
}