def main():
    n,d,k = map(int,input().split())
    mod = 1000000007
    dp = [[0] * (k + 1) for i in range(n + 1)]
    dp[0][0] = 1
    for i in range(n):
        for j in range(k):
            if dp[i][j] != 0:
                for l in range(1,d + 1):
                    if j + l <= k:
                        dp[i + 1][j + l] += dp[i][j]
                        dp[i + 1][j + l] %= mod
    print(dp[n][k])
main()