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

MOD = 10 ** 9 + 7

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

    dp = [ 0 for _ in range(K + 1)]
    dp[0] = 1
    cum_dp = [0] * (K + 1)
    c = 0
    for i in range(K + 1):
        c += dp[i]
        c %= MOD
        cum_dp[i] = c

    for _ in range(N):
        new_dp = [0 for _ in range(K + 1)]

        for k in range(K + 1):
            if k > 0:
                if k - d - 1 >= 0:
                    new_dp[k] += (cum_dp[k - 1] - cum_dp[k - d - 1]) % MOD
                else:
                    new_dp[k] += cum_dp[k - 1]
            new_dp[k] %= MOD
        dp = new_dp

        cum_dp = [0] * (K + 1)
        c = 0
        for i in range(K + 1):
            c += dp[i]
            c %= MOD
            cum_dp[i] = c

    print(dp[-1])
 

 
if __name__ == "__main__":
    main()