#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;

const ll MOD = 1e9 + 7;

map<int, ll> memo;

int d;

ll rec(int n, int k){
	int arg = n * 400 + k;
	if(memo.count(arg) == 1) return memo[arg];
	if(n == 0 && k == 0) return memo[arg] = 1;

	ll ret = 0;
	for(int i = 1; i <= d && k - i >= 0; i++){
		ret += rec(n - 1, k - i);
		ret %= MOD;
	}

	return memo[arg] = ret;
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n, k;
	cin >> n >> d >> k;

	cout << rec(n, k) << endl;	
}