use proconio::input;
fn main(){
    input!{
        a:usize,b:usize,c:usize,d:usize,
    }
    if a==0{
    	print!("{}",d/b);
    } else if b==0{
    	print!("{}",c);
    } else {
    	print!("{}",if c/a>=d/b {d/b} else {c/a});
    }
    
}