import numpy as np
mod = 10 ** 9 + 7

N, d, K = map(int, input().split())
dp = np.zeros(K + 1, dtype=np.int64)
dp[0] = 1

for _ in range(N):
    np.cumsum(dp, out=dp)
    dp %= mod
    dp[d:] -= dp[:-d]
    dp %= mod

print(dp[K - N])