#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <complex>
#include <queue>
#include <stack>
#include <cmath>
#include <cassert>
#include <cstring>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;

static const int MODVAL = 1000000007;
struct mint
{
	int val;
	mint():val(0){}
	mint(int    x):val(x%MODVAL) {} // x>=0
	mint(size_t x):val(x%MODVAL) {} // x>=0
	mint(LL     x):val(x%MODVAL) {} // x>=0
};
mint& operator+=(mint& x, mint y) { return x = x.val+y.val; }
mint& operator*=(mint& x, mint y) { return x = LL(x.val)*y.val; }
mint operator+(mint x, mint y) { return x+=y; }
mint operator*(mint x, mint y) { return x*=y; }

class BricksN { public:
	int countStructures(int w, int h, int k)
	{
		memo1.clear();
		memo2.clear();
		return rec(w, h, k).val;
	}

	map<int,mint> memo1;
	mint rec(int w, int h, int k)
	{
		if( h == 0 ) return 1;
		if( w <= 0 ) return 1;

		const int key = w*51+h;
		if( memo1.count(key) )
			return memo1[key];

		mint sum = 1;
		for(int s=0; s<w; ++s)
			for(int ww=1; s+ww<=w; ++ww)
				sum += full(ww, k) * rec(ww, h-1, k) * rec(w-(s+ww+1), h, k);
		return memo1[key] = sum;
	}

	map<int,mint> memo2;
	mint full(int w, int k)
	{
		if( w <= 0 ) return 1;

		const int key = w;
		if( memo2.count(key) )
			return memo2[key];

		mint sum = 0;
		for(int ww=1; ww<=min(w,k); ++ww)
			sum += full(w-ww, k);
		return memo2[key] = sum;
	}
};

// BEGIN CUT HERE
#include <ctime>
double start_time; string timer()
 { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
 { os << "{ ";
   for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
   os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
void verify_case(const int& Expected, const int& Received) {
 bool ok = (Expected == Received);
 if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
 cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
#define END	 verify_case(_, BricksN().countStructures(w, h, k));}
int main(){

CASE(0)
	int w = 3; 
	int h = 1; 
	int k = 3; 
	int _ = 13; 
END
CASE(1)
	int w = 3; 
	int h = 2; 
	int k = 3; 
	int _ = 83; 
END
CASE(2)
	int w = 1; 
	int h = 5; 
	int k = 1; 
	int _ = 6; 
END
CASE(3)
	int w = 10; 
	int h = 10; 
	int k = 3; 
	int _ = 288535435; 
END
CASE(4)
	int w = 50; 
	int h = 50; 
	int k = 50; 
	int _ = -1; 
END
CASE(5)
	int w = 1; 
	int h = 1; 
	int k = 1; 
	int _ = 1; 
END

}
// END CUT HERE
