#!/usr/bin/env python3
import sys
input = sys.stdin.readline
MOD = 10**9 + 7

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

print(dp[-1][-1])