21 lines
487 B
Rust
21 lines
487 B
Rust
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use std::io;
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fn main() {
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let mut s = String::new();
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io::stdin().read_line(&mut s).unwrap();
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let input = s.trim().split_whitespace().map(|s| s.parse::<u64>().unwrap()).collect::<Vec<u64>>();
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let n = input[0];
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let k = input[1];
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if k > (((n as f64/ 2.).ceil() as u64)) {
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if n % 2 == 0 {
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println!("{}", (2*(k-(n/2))))
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} else {
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println!("{}", (2*(k-((n+1)/2))))
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}
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} else {
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println!("{}", (2*k-1))
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}
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}
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