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Artifact 8a76bc3da2574066e90caa51b2f8c173bb358207


#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 <tuple>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;

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

template<typename T>
struct DP3x
{
	int N1, N2, N3;
	vector<T> data;
	DP3x(int, int N2, int N3, const T& t = T())
		: N1(2), N2(N2), N3(N3), data(N1*N2*N3, t) { assert(data.size()*sizeof(T) < (1<<28)); }
	T& operator()(int i1, int i2, int i3)
		{ i1&=1; return data[ ((i1*N2)+i2)*N3+i3 ]; }
	void swap(DP3x& rhs)
		{ data.swap(rhs.data); }
};

class WinterAndSnowmen { public:
	int getNumber(int N, int M)
	{
		const int MAX = max(N,M);
		mint total;
		for(int B=10; B>=0; --B)
		{
			int HH = 2048>>(B+1);
			DP3x<mint> dp(MAX+1, HH, 4);
			dp(0,0,0) = 1;
			for(int k=1; k<=MAX; ++k) {
				for(int high=0; high<HH; ++high)
					for(int key=0; key<4; ++key)
						dp(k, high, key) = dp(k-1, high, key);

				for(int high=0; high<HH; ++high)
					for(int key=0; key<4; ++key) {
						int kh = k>>(B+1);
						int kk = (k>>B)&1;
						if(k<=N)
							dp(k, high^kh, key^(kk<<1)) += dp(k-1,high,key);
						if(k<=M)
							dp(k, high^kh, key^kk) += dp(k-1,high,key);
					}
			}
			total += dp(MAX, 0, 1);
		}
		return total.val;
	}
};

// 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(_, WinterAndSnowmen().getNumber(N, M));}
int main(){

CASE(0)
	int N = 2; 
	int M = 2; 
	int _ = 4; 
END
CASE(1)
	int N = 1; 
	int M = 1; 
	int _ = 1; 
END
CASE(2)
	int N = 3; 
	int M = 5; 
	int _ = 74; 
END
CASE(3)
	int N = 7; 
	int M = 4; 
	int _ = 216; 
END
CASE(4)
	int N = 47; 
	int M = 74; 
	int _ = 962557390; 
END
CASE(5)
	int N = 2000; 
	int M = 2000; 
	int _ = -1; 
END
/*
CASE(6)
	int N = ; 
	int M = ; 
	int _ = ; 
END
*/
}
// END CUT HERE