import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int d = Integer.parseInt(sa[0]);
		int l = Integer.parseInt(sa[1]);
		int r = Integer.parseInt(sa[2]);
		int k = Integer.parseInt(sa[3]);
		br.close();

		int dl = 1;
		for (int i = 1; i <= d; i++) {
			if ((1 << i) > l) {
				dl = i;
				break;
			}
		}
		int dr = 1;
		for (int i = 1; i <= d; i++) {
			if ((1 << i) > r) {
				dr = i;
				break;
			}
		}

		if (dr - dl <= k && k <= (dl + dr - 2) && (dr - dl) % 2 == k % 2) {
			int mod = 1000000007;
			int end = 1 << (d - 1);
			long[] p = new long[end + 1];
			p[0] = 1;
			for (int i = 1; i < p.length; i++) {
				p[i] = p[i - 1] * i % mod;
			}
			int k2 = k - (dr - dl);
			k2 /= 2;
			long ans = 1;
			for (int i = 0; i < d; i++) {
				if (dl > 1 && i + 1 == dr) {
					if (dl == dr) {
						ans *= 1 << i;
						ans %= mod;
						ans *= 1 << (k2 - 1);
						ans %= mod;
						ans *= p[(1 << i) - 2];
					} else {
						if (k2 == 0) {
							ans *= 1 << (i - 1);
						} else {
							ans *= 1 << k2;
						}
						ans %= mod;
						ans *= p[(1 << i) - 1];
					}
				} else {
					ans *= p[1 << i];
				}
				ans %= mod;
			}
			System.out.println(ans);
		} else {
			System.out.println(0);
		}
	}
}