use std::io::*; use std::str::FromStr; use utils::*; pub fn main() { let i = stdin(); let mut o = Vec::new(); run(i.lock(), &mut o); stdout().write_all(&o).unwrap(); } fn run(i: R, o: &mut W) { let mut i = CpReader::new(i); let (a, b, c, d) = i.read4::(); writeln!(o, "{}", solve(a, b, c, d)).unwrap(); } fn solve(a: usize, b: usize, c: usize, d: usize) -> usize { [a, b / c, d / (c + 1)].iter().cloned().min().unwrap() } mod utils { use super::*; pub struct CpReader { r: R, s: String, } macro_rules! fn_read { { $f:ident($($t:ident),*) } => { #[allow(dead_code)] pub fn $f<$($t: FromStr),*>(&mut self) -> ($($t),*) { let i = &mut self.read_line().split(' '); ($(read_next::<$t,_>(i)),*) } }; } impl CpReader { pub fn new(r: R) -> Self { CpReader { r: r, s: String::new(), } } pub fn read_line(&mut self) -> &str { self.s.clear(); self.r.read_line(&mut self.s).unwrap(); self.s.trim() } fn_read! { read2(T1, T2) } fn_read! { read3(T1, T2, T3) } fn_read! { read4(T1, T2, T3, T4) } fn_read! { read5(T1, T2, T3, T4, T5) } } fn read_next<'a, T: FromStr, I: Iterator>(i: &mut I) -> T { i.next().unwrap().parse().ok().unwrap() } }