#include<iostream>
#include<vector>
#include<string>
#include<algorithm>	
#include<map>
#include<set>
#include<utility>
#include<cmath>
#include<cstring>
#include<queue>
#include<stack>
#include<cstdio>
#include<sstream>
#include<iomanip>
#include<assert.h>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define pb push_back
#define all(in) in.begin(),in.end()
#define shosu(x) fixed<<setprecision(x)
using namespace std;
//kaewasuretyuui
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vp;
typedef vector<vp> vvp;
typedef vector<string> vs;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef pair<int,pii> pip;
typedef vector<pip>vip;
const double PI=acos(-1);
const double EPS=1e-7;
const int inf=1e8;
const ll INF=1e16;
int dx[4]={0,1,0,-1};
int dy[4]={1,0,-1,0};
#define MOD 1000000007
// a^b mod MOD
ll powmod(ll a,ll b){
	ll out=1;
	ll p=a%MOD;
	while(b){
		if(b&1)out=out*p%MOD;
		p=p*p%MOD;
		b>>=1;
	}
	return out;
}
#define M 10000
vector<ll> fact;
void init(){
	fact=vector<ll>(M);
	fact[0]=fact[1]=1;
	loop(i,2,M)fact[i]=fact[i-1]*i%MOD;
}
// nCr
ll nCr(ll n,ll r){
	if(n<r)return 1;
	ll out=fact[n]*powmod(fact[r]*fact[n-r]%MOD,MOD-2)%MOD;
	return out;
}
ll nHr(ll n,ll r){
	return nCr(n+r-1,r-1);
}
int main(){
	init();
	ll n,k,d;
	cin>>n>>k>>d;
	ll out=0,s=int((double)(n-1)/(k-1)),t=n-s*(k-1);
	if(d==1){
		cout<<t<<endl;
		return 0;
	}
	rep(i,s+1){
		ll S=powmod(d,i)%MOD;
		ll T=nHr(s-i,t-1)%MOD;
		(out+=S*T%MOD)%=MOD;
	}
	cout<<out*t%MOD<<endl;
}