import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}
	
	final long M=(long)1e9+7;
	
	long factorial(long n) {
		long ret=1;
		for(int i=1;i<=n;++i)ret=ret*i%M;
		return ret;
	}
	
	long pow(long a,long n) {
		return n==0?1:((n%2==1?a:1)*pow(a*a%M,n/2))%M;
	}
	
	long inv(long a) {
		return pow(a,M-2);
	}
	
	void run() {
		Scanner sc=new Scanner(System.in);
		int d=sc.nextInt();
		int l=sc.nextInt();
		int r=sc.nextInt();
		int depth_left=Integer.numberOfTrailingZeros(Integer.highestOneBit(l))+1;
		int depth_right=Integer.numberOfTrailingZeros(Integer.highestOneBit(r))+1;
		int k=sc.nextInt();
		int diff=depth_right-depth_left;
		if(diff>k||(k-diff)%2==1||(k-diff)>(depth_left-1)*2) {
			System.out.println(0);
			return;
		}
		long ans=1;
		for(int i=1;i<=d;++i) {
			ans=ans*factorial(1<<(i-1))%M;
		}
		long w=1L<<(depth_left-1);
		if(depth_left!=depth_right) {
			ans=ans*inv(w)%M*((k-diff)==0?1:(1L<<((k-diff)/2-1)))%M;
		}else {
			ans=ans*inv(w-1)%M*((k-diff)==0?1:(1L<<((k-diff)/2-1)))%M;
		}
		System.out.println(ans);
	}
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}