# coding:UTF-8
import sys

MOD = 10 ** 9 + 7
INF = float('inf')

N, D, K = list(map(int, input().split()))     # スペース区切り連続数字

dp = [[0] * (K + 1) for _ in range(N + 1)]
dp[0][0] = 1

for n in range(1, N+1):
    for i in range(1, K+1):
        s = 0
        for j in range(1, D+1):
            tar = i - j
            if tar < 0:
                break
            s = (s + dp[n-1][tar]) % MOD
        dp[n][i] = s

print("{}".format(dp[N][K]))