#include<bits/stdc++.h>
using lint=long long;
lint mod=1'000'000'007;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint n,d,K;std::cin>>n>>d>>K;
    std::vector<lint>dp(K+2),swp(K+2);
    for(lint i=1;i<=K+1;i++)dp.at(i)=1;
    for(lint i=0;i<n;i++){
        swp.assign(K+2,0);
        for(lint j=1;j<=K+1;j++){
            swp.at(j)=(swp.at(j-1)+dp.at(j-1)-dp.at(std::max(0ll,j-1-d))+mod)%mod;
        }
        swp.swap(dp);
    }
    std::cout<<(dp.at(K+1)-dp.at(K)+mod)%mod<<'\n';
}