#include <iostream>

using namespace std;
int dig(int x){
	int d = 0;
	while(x){
		x /= 2;
		d++;
	}
	return d;
}
long long mod = 1000000007,f[1<<21];
void solve(){
	f[0] = 1;
	int i;
	for(i=1;i<(1<<20);i++){
		f[i] = i*f[i - 1]%mod;
	}
}

int main(){
	int i,j,d,l,r,k;
	cin >> d >> l >> r >> k;
	int d1 = dig(l),d2 = dig(r);
	if(d1 + d2 - k<=0 || (d1 + d2 - k)&1){
		cout << 0 << endl;
		return 0;
	}
	solve();
	int dep = (d1 + d2 - k)/2;
	long long ans = 1;
	for(i=1;i<=d;i++){
		if(i!=d2){
			(ans *= f[1<<(i - 1)]) %= mod;
		}
	}
	int d3 = d2 - dep;
	if(dep!=d1) d3--;
	if(d1==d2){
		(ans *= (1<<(d2 - 1))) %= mod;
		(ans *= f[(1<<(d2 - 1)) - 2]) %= mod;
		(ans *= (1<<(d3))) %= mod;
	}else{
		(ans *= f[(1<<(d2 - 1)) - 1]) %=mod;
		(ans *= (1<<(d3))) %= mod;
	}
	cout << ans << endl;
}