const MOD: usize = 1e9 as usize + 7;

fn power(base: usize, times: usize, modval: usize) -> usize {
    if times == 0 { return 1usize; }
    if times == 1 { return base; }
    let temp = power(base, times/2, modval);
    temp * temp % modval * power(base, times%2, modval) % modval
}

fn main() {
    let mut abc = String::new();
    std::io::stdin().read_line(&mut abc).ok();
    let abc: Vec<usize> = abc.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let mut k = String::new();
    std::io::stdin().read_line(&mut k).ok();
    let k: usize = k.trim().parse().unwrap();

    let base = abc.iter().fold(1usize, |x, &y| x * y % MOD);
    let powval = power(2usize, k, MOD-1);
    println!("{}", power(base, powval, MOD));
}