## https://yukicoder.me/problems/no/1011

MOD = 10 ** 9 + 7

def main():
    N, d, K = map(int, input().split())

    dp = [[0] * (N + 1) for _ in range(K + 1)]
    dp[0][0] = 1
    cum_dp = [[0] * (N + 1) for _ in range(K + 1)]
    for n in range(N + 1):
        cum_dp[0][n] = dp[0][n]

    for k in range(1, K + 1):
        for n in range(N + 1):
            new_n = n + 1
            if new_n <= N:
                if k - d - 1 >= 0:  
                    dp[k][new_n] += (cum_dp[k - 1][n] - cum_dp[k - d - 1][n]) % MOD
                else:
                    dp[k][new_n] += cum_dp[k - 1][n] 
                dp[k][new_n] %= MOD
        
        for n in range(N + 1):
            cum_dp[k][n] = (dp[k][n] + cum_dp[k - 1][n]) % MOD
            cum_dp[k][n] %= MOD

    print(dp[-1][N])
 

 
if __name__ == "__main__":
    main()