use std::io::*;
const MOD: u64 = 1_000_000_007;

fn pow(mut x: u64, mut e: u64) -> u64 {
    let mut res = 1u64;
    while e > 0 {
        if e & 1 == 1 {
            res = res * x % MOD;
        }
        x = x * x % MOD;
        e >>= 1;
    }
    res
}

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: u64 = itr.next().unwrap().parse().unwrap();
    if n == 1 {
        println!("2");
        return;
    }

    let mut ans = 4u64 * pow(5, n / 2 - 1) % MOD;

    if n & 1 == 1 {
        ans = (ans * 3) % MOD;
    }

    println!("{}", ans);
}