func main()
	const mod: int :: 1000000007
	var n: int :: cui@inputInt()
	var d: int :: cui@inputInt()
	var k: int :: cui@inputInt()
	; dp[i][j] = val
	; i: 移動した回数
	; j: 昇ったステップ
	; val: 通り数
	var dp: [][]int :: #[n + 1, k + 1]int
	do dp[0][0] :: 1
	for i(0, n - 1)
		for j(0, k - 1)
			for x(1, d)
				if(dp[i][j] <> 0 & j + x <= k)
					do dp[i + 1][j + x] :+ dp[i][j]
					do dp[i + 1][j + x] :% mod
				end if
			end for
		end for
	end for
	
	var ans: int :: dp[n][k]
	do cui@print("\{ans}\n")
end func