#include <bits/stdc++.h>
#include <string>
#define ft first
#define sc second
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) (a)=(a>b)?(a):(b);
#define chmin(a, b) (a)=(a<b)?(a):(b);
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> PL;
static const ll INF=1e18;
static const ll MAX=101010;
#define MOD 1000000007

/*
 for(i=0; i<N; i++)
   cin >> a[i];
*/

ll dp[333][333*333]={};
ll s[333][333*333]={};

int main(void) {
  ll i, j, k;
  
  ll N, D, K;
  cin >> N >> D >> K;
  
  dp[0][0]=1;
  s[0][0]=1;
  for(i=0; i<N; i++) {
    for(j=1; j<=K; j++) s[i][j]=(s[i][j-1]+dp[i][j])%MOD;
    
    for(j=1; j<=K; j++)
      dp[i+1][j]=(s[i][j-1]-s[i][j-D-1]+MOD)%MOD;
  }
  
  cout << dp[N][K] << endl;
  
}