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

dp = [0] * (d * N + 1 + d)
dp[0] = 1

for i in range(N):
    for j in range(d * N + 1, -1, -1):
        if dp[j] == 0:
            continue
        for k in range(1, d + 1):
            dp[j + k] += dp[j]
            dp[j + k] %= 1000000007
print(dp[K])