N,D,K = map(int,input().split())
DIV = 10 ** 9 + 7
dp = [0] * (K + 1)
dp[0] = 1
for n in range(N):
    new_dp = [0] * (K + 1)
    for i in range(K - 1, -1, -1):
        if dp[i] == 0:
            continue
        for d in range(1, D + 1):
            if i + d > K:
                break
            new_dp[i + d] += dp[i]
            new_dp[i + d] %= DIV
    dp = new_dp

print(dp[K])