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use std::io ;
fn main() {
println!("Enter some integers, separated by blanks!");
let mut inline : String = String::new( ) ;
io::stdin( ).read_line( &mut inline ).unwrap( ) ;
let entered_line : &str = &*inline ;
let numbers : Vec<i32> = entered_line.split_whitespace( ).map( | s |
s.trim( ).parse::<i32>( ).unwrap( )).collect( ) ;
println!("Enter a start number!") ;
let mut numline : String = String::new( ) ;
io::stdin( ).read_line( &mut numline ).unwrap( ) ;
let nline : &str = &*numline ;
let start : i32 = nline.trim( ).parse::<i32>( ).unwrap( ) ;
let mut found : i32 = start ;
let mut f = numbers.iter( ).find( | &d | *d == found ) ;
while f.is_some( ) {
found = found * 2 ;
f = numbers.iter( ).find( | &d | *d == found ) ;
}
println!("{}" , found ) ;
}
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