#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <algorithm>
using namespace std;

#define REP(i,n) for(int i=0; i<n; ++i)
#define FOR(i,a,b) for(int i=a; i<=b; ++i)
#define FORR(i,a,b) for (int i=a; i>=b; --i)
#define ALL(c) (c).begin(), (c).end()

typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<VI> VVI;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;

#define mod 1000000007

ll add(ll x, ll y){
    return (x+y)%mod;
}

ll mul(ll x, ll y){
    return (x%mod)*(y%mod)%mod;
}

ll powll(ll x, ll y){
    ll res = 1LL;
    while(y){
        if (y & 1LL)
            res *= x;
        res %= mod;
        x = (x*x) % mod;
        y >>= 1LL;
    }
    return res;
}

ll divll(ll x, ll y){
    return (x * powll(y,mod-2)) % mod;
}

ll nPr(ll n, ll r){
    ll res = 1LL;
    FOR(i,1,r){
        res = (res * ((n-i+1) % mod)) % mod;
    }
    return res;
}

ll nCr(ll n, ll r){
    ll res = nPr(n,r);
    FOR(i,1,r){
        res = (res * powll(i,mod-2)) % mod;
    }
    return res;
}

int main() {
    ll n, k, d;
    cin >> n >> k >> d;
    ll x = (n-1)/(k-1), m = n - x*(k-1);
    if(d == 1){
        cout << m << endl;
        return 0;
    }
    ll ans = 0, dd = 1;
    ll ncr = nCr(m-2+x, x);
    for (ll y = 0; y <= x; y++){
        ans = (ans + dd * nCr(m-2+x-y, x-y)) % mod;
        dd = (dd * d) % mod;
        ncr = (ncr * (x-y)) % mod;
        ncr = divll(ncr, m-2+x-y);
    }
    ans = (ans * m) % mod;
    cout << ans << endl;

    return 0;
}