import numpy as np

N, D, K = map(int, input().split())
MOD = 10 ** 9 + 7
dp = np.zeros(K + 1, dtype=np.int64)
dp[0] = 1
for _ in range(N):
    new_dp = np.zeros(K + 1, dtype=np.int64)
    new_dp[1:] += dp[:-1]
    new_dp[D + 1:] -= dp[:-D - 1]
    new_dp %= MOD
    dp = np.cumsum(new_dp) % MOD
print(dp[K])