#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let v = read_vec::<i64>();
    let (h, w, k) = (v[0], v[1], v[2]);
    if k == 1 {
        println!("1");
        return;
    }
    if h == 1 || w == 1 {
        assert!(false);
    }
    if k == 2 {
        let total = 2i64.pow((h * w) as u32) - 2;
        let raw_same = 2i64.pow(h as u32) - 2;
        let col_same = 2i64.pow(w as u32) - 2;
        let rc = raw_same + col_same;
        let ans = (total - rc) / (h * w) + raw_same / h + col_same / w;
        println!("{}", ans);
        return;
    }
    assert!(false);
    let total = 3i64.pow((h * w) as u32) - 3 * 2i64.pow((h * w) as u32) + 3;
    let raw_same = 3i64.pow(h as u32) - 3 * 2i64.pow(h as u32) + 3;
    let col_same = 3i64.pow(w as u32) - 3 * 2i64.pow(w as u32) + 3;
    let rc = raw_same + col_same;
    debug!(total, raw_same, col_same);
    let ans = (total - rc) / (h * w) + raw_same / h + col_same / w;
    println!("{}", ans);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}