#include <bits/stdc++.h>
using namespace std;
#include <boost/multiprecision/cpp_int.hpp>
namespace mp=boost::multiprecision;
int main(){
    int MOD=pow(10,9)+7;
    int N,d,K;
    cin>>N>>d>>K;
    vector<vector<int>> dp(N+1,vector<int>(K+1,1));
    for(int i=1;i<N+1;++i){
        for(int j=0;j<K+1;++j){
            if(j-d-1>=0){
                dp[i][j]=(dp[i][j-1]+dp[i-1][j-1]-dp[i-1][j-d-1])%MOD;
            }else{
                dp[i][j]=(dp[i][j-1]+dp[i-1][j-1])%MOD;
            }
        }
    }
    cout<<(MOD+dp[N][K]-dp[N][K-1])%MOD<<endl;
}