#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<iostream>
#include<vector>
using namespace std;
using i32 = int_fast32_t;
using i64 = int_fast64_t;
#define rep(i, n) for (i32 i = 0; i < (i32)(n); i++)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
using P = pair<i64,i64>;
constexpr i64 MAX = 10000000;
constexpr i64 MOD = 1000000007;

int main(){
ios::sync_with_stdio(false);
std::cin.tie(nullptr);
i64 n,d,k;
cin >> n >> d >> k;
vector<vector<i64>> dp(n + 1,vector<i64> (k + 1,0));
dp[0][0] = 1;
rep(i,n){
    rep(j,k){
        if(dp[i][j] != 0){
            for(i64 l = 1; l < d + 1; l++){
                if(j + l <= k){
                    dp[i + 1][j + l] += dp[i][j];
                    dp[i + 1][j + l] %= MOD;
                }
            }
        }
    }
}
cout << dp[n][k] << endl;
}