MOD = 10 ** 9 + 7

n, d, k = map(int, input().split())
dp = [0] * (k + 1)
dp[0] = 1
for _ in range(n):
    for i in range(1, k + 1):
        dp[i] += dp[i - 1]
        dp[i] %= MOD
    ndp = [0] * (k + 1)
    for i in range(1, k + 1):
        bef = i - d - 1
        ndp[i] = dp[i - 1]
        if bef >= 0:
            ndp[i] -= dp[bef]
        ndp[i] %= MOD
    dp = ndp
print(dp[k])