macro_rules! input { (source = $s:expr, $($r:tt)*) => { let mut iter = $s.split_whitespace(); input_inner!{iter, $($r)*} }; ($($r:tt)*) => { #[allow(unused_mut)] let mut s = { use std::io::Read; let mut s = String::new(); std::io::stdin().read_to_string(&mut s).expect("Failed to read from stdin"); 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) => { match $iter.next() { Some(s) => s.parse::<$t>().expect(&format!("Failed to parse '{}' as {}", s, stringify!($t))), None => panic!("Unexpected end of input while parsing {}", stringify!($t)), } }; } fn main() { input!{ a: usize, b: usize, } println!("{}", b / a + if b % a > 0 { 1 } else { 0 }); }