Problem:
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Score : 1000 points

Problem Statement

Niwango-kun has \(N\) chickens as his pets. The chickens are identified by numbers \(1\) to \(N\), and the size of the \(i\)-th chicken is a positive integer \(a_i\).

\(N\) chickens decided to take each other's hand (wing) and form some cycles. The way to make cycles is represented by a permutation \(p\) of \(1, \ldots , N\). Chicken \(i\) takes chicken \(p_i\)'s left hand by its right hand. Chickens may take their own hand.

Let us define the cycle containing chicken \(i\) as the set consisting of chickens \(p_i, p_{p_i}, \ldots, p_{\ddots_i} = i\). It can be proven that after each chicken takes some chicken's hand, the \(N\) chickens can be decomposed into cycles.

The beauty \(f(p)\) of a way of forming cycles is defined as the product of the size of the smallest chicken in each cycle.
Let \(b_i \ (1 \leq i \leq N)\) be the sum of \(f(p)\) among all possible permutations \(p\) for which \(i\) cycles are formed in the procedure above.

Find the greatest common divisor of \(b_1, b_2, \ldots, b_N\) and print it \({\rm mod} \ 998244353\).

Constraints

\(1 \leq N \leq 10^5\)

\(1 \leq a_i \leq 10^9\)

All numbers given in input are integers

Input

Input is given from Standard Input in the following format:

\(N\)
\(a_1\) \(a_2\) \(\ldots\) \(a_N\)

Output

Print the answer.

Sample Input 1

2
4 3

Sample Output 1

3

In this case, \(N = 2, a = [ 4, 3 ]\).

For the permutation \(p = [ 1, 2 ]\), a cycle of an only chicken \(1\) and a cycle of an only chicken \(2\) are made, thus \(f([1, 2]) = a_1 \times a_2 = 12\).

For the permutation \(p = [ 2, 1 ]\), a cycle of two chickens \(1\) and \(2\) is made, and the size of the smallest chicken is \(a_2 = 3\), thus \(f([2, 1]) = a_2 = 3\).

Now we know \(b_1 = f([2, 1]) = 3, b_2 = f([1, 2]) = 12\), and the greatest common divisor of \(b_1\) and \(b_2\) is \(3\).

Sample Input 2

4
2 5 2 5

Sample Output 2

2

There are always \(N!\) permutations because chickens of the same size can be distinguished from each other.

The following picture illustrates the cycles formed and their beauties when \(p = (2, 1, 4, 3)\) and \(p = (3, 4, 1, 2)\), respectively.

Solution in Rust (1.15.1) (judge verdict: Accepted)

// https://atcoder.jp/contests/dwacon5th-prelims/tasks/dwacon5th_prelims_e
//
#![allow(unused_imports)]
use std::io::*;
use std::io::Write;
use std::fmt::*;
use std::str::*;
use std::cmp::*;
use std::collections::*;

// Input macros.
// Original by tanakh: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

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

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

#[allow(unused_macros)]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

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

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

    ($iter:expr, switch) => {
        {
            let ty = read_value!($iter, i32);
            if ty == 1 {
                vec![ty, read_value!($iter, i32), read_value!($iter, i32)]
            } else if ty == 2 {
                vec![ty, read_value!($iter, i32)]
            } else {
                vec![ty, read_value!($iter, i32)]
            }
        }
    };

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

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

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

#[allow(unused_macros)]
macro_rules! read_line {
    ($t:tt) => {
        {
            let mut s = String::new();
            std::io::stdin().read_line(&mut s).unwrap();
            s.trim_right().parse::<$t>().unwrap()
        }
    }
}

#[allow(unused_macros)]
macro_rules! dvec {
    ($t:expr ; $len:expr) => {
        vec![$t; $len]
    };

    ($t:expr ; $len:expr, $($rest:expr),*) => {
        vec![dvec!($t; $($rest),*); $len]
    };
}

#[allow(unused_macros)]
macro_rules! ifv {
    ($t:expr, $a:expr, $b: expr) => {
        if $t { $a } else { $b }
    }
}

#[allow(unused_macros)]
macro_rules! fill {
    ($t:expr, $v:expr) => {
        for i in 0..$t.len() {
            $t[i] = $v;
        }
    };
}

#[allow(unused_macros)]
macro_rules! join {
    ($t:expr, $glue:expr) => {
        $t.into_iter().map(|w| w.to_string()).collect::<Vec<_>>().join($glue)
    };
}

#[allow(unused_macros)]
macro_rules! debug {
    ($($a:expr),*) => {
        println!(concat!($(stringify!($a), " = {:?}, "),*), $($a),*);
    }
}

// ===

const MOD: i64 = 998244353;

fn gcd(a: i64, b: i64) -> i64 {
    if b == 0 {
        a
    } else {
        gcd(b, a%b)
    }
}

fn main() {
    input! {
        n: usize,
        mut a: [i64; n]
    };
    a.sort();


    let mut g = a[0];
    for i in 1..n {
        g *= gcd(a[i], i as i64);
        g %= MOD;
    }
    println!("{}", g);
}