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

dp[0][0] = 1
for i in range(0, K+1):
    dp_sum[0][i] = 1

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

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