use std::io::Read;

fn main() {
    const DIVIDER: usize = 1_000_000_007;
    let mut all_data = String::new();
    std::io::stdin().read_to_string(&mut all_data).ok();
    let dlrk: Vec<usize> = all_data.trim().split('\n').next().unwrap().trim().split_whitespace()
        .map(|s| s.parse().unwrap())
        .collect();
    let d: usize = dlrk[0];
    let l: usize = dlrk[1];
    let r: usize = dlrk[2];
    let k: usize = dlrk[3];
    let mut l_count = 0;
    let mut r_count = 0;
    for i in 1..=d {
        if l < 2i32.pow(i as u32) as usize {
            l_count = i;
            break;
        }
    }
    for i in 1..=d {
        if r < 2i32.pow(i as u32) as usize {
            r_count = i;
            break;
        }
    }
    if l_count < r_count {
        if (r_count - l_count + k) % 2 == 1 {
            println!("{}", 0);
        } else if r_count - l_count > k || r_count + l_count - 2 < k {
            println!("{}", 0);
        } else {
            let mut result: usize = 1;
            for depth in 1..=d {
                if depth == r_count {
                    for i in 1..(2i32.pow(depth as u32 -1)) {
                        result *= i as usize;
                        result %= DIVIDER;
                    }
                    if r_count - l_count == l {
                        result *= 2i32.pow(r_count as u32 - l_count as u32) as usize;
                    } else {
                        result *= 2i32.pow(r_count as u32 - l_count as u32 + (k as u32 + l_count as u32 - r_count as u32) / 2 - 1u32) as usize;
                    }
                    result %= DIVIDER;
                } else {
                    for i in 1..=(2i32.pow(depth as u32 -1)) {
                        result *= i as usize;
                        result %= DIVIDER;
                    }
                }
            }
            println!("{}", result);
        }
    } else {
        if k < 2 || k % 2 != 0 || r_count + l_count - 2 < k {
            println!("{}", 0);
        } else {
            let mut result: usize = 1;
            for depth in 1..=d {
                if depth == r_count {
                    for i in 1..(2i32.pow(depth as u32 -1) - 1) {
                        result *= i as usize;
                        result %= DIVIDER;
                    }
                    result *= 2i32.pow(depth as u32 -1) as usize;
                    result %= DIVIDER;
                    result *= 2i32.pow((k as u32) / 2 - 1) as usize;
                    result %= DIVIDER;
                } else {
                    for i in 1..=(2i32.pow(depth as u32 -1)) {
                        result *= i as usize;
                        result %= DIVIDER;
                    }
                }
            }
            println!("{}", result);
        }
    }
}