#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np
MOD = 10**9 + 7

N, D, K = map(int, read().split())
K -= N
dp = np.zeros(D * N, np.int64)
dp[0] = 1
for _ in range(N):
    dp[D:] -= dp[:-D]
    np.cumsum(dp, out=dp)
    dp %= MOD
print(dp[K])