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

    buf0 = [0] * (d * N + K + 1)
    buf1 = [0] * (d * N + K + 1)
    buf0[0] = 1

    for i in range(N):
        t = 0
        for j in range(d):
            t += buf0[j]
            t %= 1000000007
            buf1[j] = t
        for j in range(d, (i + 1) * d):
            t -= buf0[j - d]
            t += buf0[j]
            t %= 1000000007
            buf1[j] = t
        buf0, buf1 = buf1, buf0

    print(buf0[K - N])


main()