#include<bits/stdc++.h>
using namespace std;

#define all(v) v.begin(),v.end()
using ll = long long;
using ull = unsigned long long;
using vll=vector<ll>;
using vvll = vector<vector<ll>>;
ll mod=1e9+7;

int main(){
    ll N,D,K;
    cin>>N>>D>>K;
    vvll dp(N+1,vll(D*K+3));
    dp[0][0]=1;
    for(int i=1;i<=N;i++){
        vll rw(D*K+3);
        for(int j=0;j<=D*K;j++){
            rw[j+1]+=rw[j]+dp[i-1][j];
        }
        for(int j=0;j<=D*K;j++){
            dp[i][j]+=rw[j]-rw[max(0ll,j-D)];
            dp[i][j]%=mod;
        }
    }
    cout << dp[N][K] << endl;
}