#include <stdio.h>
#include <iostream>
//#include <boost/multiprecision/cpp_int.hpp>
// #include <bootstrap.h>

using namespace std;
// namespace mp = boost::multiprecision;

// using Bint = mp::cpp_int;
// using Real = mp::number<mp::cpp_dec_float<1024>>;

int main(){
    int n , d , k ;
    cin >> n >> d >> k ;

    long long mod = 1000000000 + 7;

    long long dp[n+1][k+1] ;

    for(int i = 0 ; i < n+1 ; i++){
        for(int j = 0 ; j < k+1 ; j++){
            dp[i][j] = 0;
        }
    }

    dp[0][0] = 1;

    for(int i = 1 ; i<= n ; i++){
        for(int j = 0 ; j < k ; j++){
            for(int l = 1 ; l <=d ; l++ ){
                if( j+l <= k){
                    dp[i][j+l] = (dp[i][j+l] + dp[i-1][j]) % mod ;
                }else{
                    break;
                }
            }
        }

    }

    cout << dp[n][k]  << endl;
    // cout << dp[n][k] << endl ;

}