macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        let mut next = || { iter.next().unwrap() };
        input_inner!{next, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String {
            bytes
                .by_ref()
                .map(|r| r.unwrap() as char)
                .skip_while(|c| c.is_whitespace())
                .take_while(|c| !c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};

    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };

    ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };

    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };

    ($next:expr, [ $t:tt ]) => {
        {
            let len = read_value!($next, usize);
            (0..len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
        }
    };

    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };

    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };

    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}

// only atcoder
/*
#[allow(unused_imports)]
use num::integer::{gcd, lcm};
#[allow(unused_imports)]
use permutohedron::LexicalPermutation;
*/
#[allow(unused_imports)]
use std::cmp;
#[allow(unused_imports)]
use std::collections::{BinaryHeap, HashMap, HashSet};
#[allow(dead_code)]
const MOD: i32 = 1e9 as i32 + 7;

mod prime {
    pub fn is_prime(n: usize) -> bool {
        match n {
            0 | 1 => false,
            2 => true,
            _ => {
                if n % 2 == 0 {
                    return false;
                }
                let mut i = 3;
                while i <= (n as f64).sqrt() as usize + 1 {
                    if n % i == 0 {
                        return false;
                    }
                    i+=2;
                }
                true
            }
        }
    }
    pub fn prime_all(n: usize) -> Vec<usize> {
        let mut list = Vec::new();
        for i in 2..n + 1 {
            if is_prime(i) {
                list.push(i);
            }
        }
        list
    }
    
    pub fn factorize(mut n: usize) -> Vec<(usize, usize)> {
        let mut list = Vec::new();
        if is_prime(n) {
            list.push((n, 1));
            return list;
        }
        let primes = prime_all((n as f64).sqrt() as usize + 1);
        for x in &primes {
            let x = *x;
            if n % x != 0 {
                continue;
            }
            list.push((x, 0_usize));
            while n % x == 0 {
                n/=x;
                let index = list.len() - 1;
                list[index].1 += 1;
            }
            if is_prime(n) {
                list.push((n,1));
                break;
            }
        }
        list
    }
}


fn main() {
    input!(n:usize);
    print!("{}:",n);
    let list = prime::factorize(n);
    for x in &list {
        let mut i = 0;
        while i < x.1 {
            print!(" {}",x.0);
            i+=1;
        }
    }
    println!();
}



Measured memory_bytes: 5024