use std::collections::HashMap; #[allow(unused_imports)] use std::io::Write; // {{{1 #[allow(unused)] macro_rules! debug { ($($format:tt)*) => (write!(std::io::stderr(), $($format)*).unwrap()); } #[allow(unused)] macro_rules! debugln { ($($format:tt)*) => (writeln!(std::io::stderr(), $($format)*).unwrap()); } macro_rules! input { (source = $s:expr, $($r:tt)*) => { let mut iter = $s.split_whitespace(); input_inner!{iter, $($r)*} }; ($($r:tt)*) => { let mut 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)*} }; } 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)*} }; } macro_rules! read_value { ($iter:expr, ( $($t:tt),* )) => { ( $(read_value!($iter, $t)),* ) }; ($iter:expr, [ $t:tt ; $len:expr ]) => { (0..$len).map(|_| read_value!($iter, $t)).collect::>() }; ($iter:expr, chars) => { read_value!($iter, String).chars().collect::>() }; ($iter:expr, usize1) => { read_value!($iter, usize) - 1 }; ($iter:expr, $t:ty) => { $iter.next().unwrap().parse::<$t>().expect("Parse error") }; } // }}} fn main() { input! { x: usize, } let mut v = vec![]; for i in 0..=x { v.push(i); } for i in 1..=x { let mut m = i; while m <= x { v[m] -= 1; m += i; } } // eprintln!("{:?}", v); let mut min = std::isize::MAX; let mut ans = vec![]; for i in 1..x { let a = i; let b = x - i; let tmp = (v[a] as isize - v[b] as isize).abs(); if tmp == min { ans.push((a, b)); } else if tmp < min { ans = vec![(a, b)]; min = tmp; } } for (a, b) in ans { println!("{} {}", a, b); } }