#pragma GCC optimize ("O3")
#pragma GCC target ("avx")
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int d, l, r, k;
	cin >> d >> l >> r >> k;

	ll kotae = 1;
	ll mod = 1e9 + 7;
	int dl = 0, dr = 0;
	while (l) {
		l /= 2;
		dl++;
	}
	while (r) {
		r /= 2;
		dr++;
	}

	int saidai = dl + dr - 2;
	if (saidai < k) {
		co(0);
	}
	else if ((saidai + k) % 2) {
		co(0);
	}
	else if (abs(dl - dr) > k) {
		co(0);
	}
	else {
		if (dl == dr) {
			rep1(i, d) {
				if (i != dl) {
					rep1(j, 1 << (i - 1)) kotae = kotae * j % mod;
				}
				else {
					kotae = kotae * (1 << (i - 1)) % mod;
					kotae = kotae * (1 << (k / 2 - 1)) % mod;
					rep1(j, (1 << (i - 1)) - 2) kotae = kotae * j % mod;
				}
			}
			co(kotae);
		}
		else {
			int lr = min(dl, dr);
			rep1(i, d) {
				if (i != lr) {
					rep1(j, 1 << (i - 1)) kotae = kotae * j % mod;
				}
				else {
					k -= abs(dl - dr);
					if (k == 0) k += 2;
					kotae = kotae * (1 << (k / 2 - 1)) % mod;
					rep1(j, (1 << (i - 1)) - 1) kotae = kotae * j % mod;
				}
			}
			co(kotae);
		}
	}


	Would you please return 0;
}