// -*- coding:utf-8-unix -*- // #![feature(map_first_last)] #![allow(dead_code)] #![allow(unused_imports)] #![allow(unused_macros)] use std::any::Any; use std::cmp::Ordering::*; use std::collections::*; use std::convert::*; use std::convert::{From, Into}; use std::error::Error; use std::f64::consts::PI; use std::fmt::Debug; use std::fmt::Display; use std::fs::File; use std::hash::Hash; use std::io::prelude::*; use std::io::*; use std::iter::Filter; use std::marker::Copy; use std::mem::*; use std::ops::Bound::*; use std::ops::RangeBounds; use std::ops::{Add, Mul, Neg, Sub}; use std::process; use std::slice::from_raw_parts; use std::str; use std::vec; const INF: i64 = 1223372036854775807; const UINF: usize = INF as usize; // const FINF: f64 = 122337203685.0; const LINF: i64 = 2147483647; const FINF: f64 = LINF as f64; const INF128: i128 = 1223372036854775807000000000000; const MOD: i64 = 1000000007; // const MOD: i64 = 998244353; const MPI: f64 = 3.14159265358979323846264338327950288f64; // const MOD: i64 = INF; const UMOD: usize = MOD as usize; use std::cmp::*; use std::collections::*; use std::io::stdin; use std::io::stdout; use std::io::Write; macro_rules! p { ($x:expr) => { println!("{}", $x); }; } macro_rules! d { ($x:expr) => { println!("{:?}", $x); }; } // use str::Chars; fn main() { solve(); } // use str::Chars; #[allow(dead_code)] fn read() -> T { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); s.trim().parse().ok().unwrap() } #[allow(dead_code)] fn readi() -> (i64) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); iter.next().unwrap().parse::().unwrap() } #[allow(dead_code)] fn read_vec() -> Vec { read::() .split_whitespace() .map(|e| e.parse().ok().unwrap()) .collect() } #[allow(dead_code)] fn read_mat(n: u32) -> Vec> { (0..n).map(|_| read_vec()).collect() } #[allow(dead_code)] fn readii() -> (i64, i64) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); ( iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), ) } fn readff() -> (f64, f64) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); ( iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), ) } #[allow(dead_code)] fn readiii() -> (i64, i64, i64) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); ( iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), ) } #[allow(dead_code)] fn readuu() -> (usize, usize) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); ( iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), ) } fn readcc() -> (char, char) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); ( iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), ) } fn readuuu() -> (usize, usize, usize) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); ( iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), ) } #[allow(dead_code)] fn readiiii() -> (i64, i64, i64, i64) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); ( iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), ) } #[allow(dead_code)] fn readuuuu() -> (usize, usize, usize, usize) { let mut str = String::new(); let _ = stdin().read_line(&mut str).unwrap(); let mut iter = str.split_whitespace(); ( iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), iter.next().unwrap().parse::().unwrap(), ) } trait SEGLazyImpl { type Monoid: Copy; type OperatorMonoid: Copy + PartialEq; fn m0() -> Self::Monoid; fn om0() -> Self::OperatorMonoid; fn f(x: Self::Monoid, y: Self::Monoid) -> Self::Monoid; fn g(x: Self::Monoid, y: Self::OperatorMonoid, weight: usize) -> Self::Monoid; fn h(x: Self::OperatorMonoid, y: Self::OperatorMonoid) -> Self::OperatorMonoid; } struct SEGLazy { n: usize, data: Vec, lazy: Vec, weight: Vec, } impl SEGLazy { pub fn new(n: usize, init: T::Monoid) -> SEGLazy { let weights = vec![1; n]; Self::with_weight(n, init, weights) } pub fn with_weight(n: usize, init: T::Monoid, weights: Vec) -> Self { let mut m = 1; while m < n { m *= 2; } SEGLazy { n: m, data: vec![init; m * 2], lazy: vec![T::om0(); m * 2], weight: Self::mk_weight(&weights), } } fn mk_weight(xs: &[usize]) -> Vec { let n = xs.len(); let mut m = 1; while m < n { m *= 2; } let mut res = vec![0; 2 * m]; for i in 0..n { res[m + i] = xs[i]; } for k in (1..m).rev() { let l = 2 * k; let r = 2 * k + 1; res[k] = res[l] + res[r]; } res } fn propagate(&mut self, k: usize) { let weight = self.weight[k]; if self.lazy[k] != T::om0() { if k < self.n { self.lazy[2 * k + 0] = T::h(self.lazy[2 * k + 0], self.lazy[k]); self.lazy[2 * k + 1] = T::h(self.lazy[2 * k + 1], self.lazy[k]); } self.data[k] = T::g(self.data[k], self.lazy[k], weight); self.lazy[k] = T::om0(); } } fn do_update( &mut self, a: usize, b: usize, x: T::OperatorMonoid, k: usize, l: usize, r: usize, ) -> T::Monoid { self.propagate(k); if r <= a || b <= l { self.data[k] } else if a <= l && r <= b { self.lazy[k] = T::h(self.lazy[k], x); self.propagate(k); self.data[k] } else { self.data[k] = T::f( self.do_update(a, b, x, 2 * k + 0, l, (l + r) >> 1), self.do_update(a, b, x, 2 * k + 1, (l + r) >> 1, r), ); self.data[k] } } #[doc = "[l,r)"] pub fn update(&mut self, l: usize, r: usize, x: T::OperatorMonoid) -> T::Monoid { let n = self.n; self.do_update(l, r, x, 1, 0, n) } fn do_query(&mut self, a: usize, b: usize, k: usize, l: usize, r: usize) -> T::Monoid { self.propagate(k); if r <= a || b <= l { T::m0() } else if a <= l && r <= b { self.data[k] } else { T::f( self.do_query(a, b, 2 * k + 0, l, (l + r) >> 1), self.do_query(a, b, 2 * k + 1, (l + r) >> 1, r), ) } } #[doc = "[l,r)"] pub fn query(&mut self, l: usize, r: usize) -> T::Monoid { let n = self.n; self.do_query(l, r, 1, 0, n) } } struct RUQ; impl SEGLazyImpl for RUQ { type Monoid = i64; type OperatorMonoid = i64; fn m0() -> Self::Monoid { INF } fn om0() -> Self::OperatorMonoid { INF } fn f(x: Self::Monoid, y: Self::Monoid) -> Self::Monoid { std::cmp::min(x, y) } fn g(x: Self::Monoid, y: Self::OperatorMonoid, _: usize) -> Self::Monoid { min(x, y) } fn h(x: Self::OperatorMonoid, y: Self::OperatorMonoid) -> Self::OperatorMonoid { min(x, y) } } // #[test] // fn test_MAX_RUQ() { // let mut seg: SEGLazy = SEGLazy::new(10, MAX_RUQ::m0()); // assert_eq!(seg.query(0, 3), 0); // seg.update(0, 2, 10); // [10,10,0,...] // assert_eq!(seg.query(0, 3), 10); // assert_eq!(seg.query(2, 3), 0); // seg.update(1, 5, 20); // assert_eq!(seg.query(0, 3), 20); // assert_eq!(seg.query(0, 1), 10); // seg.update(0, 1, 5); // assert_eq!(seg.query(0, 1), 5); // } fn solve() { let (n, m) = readuu(); if m == 1 { p!(n); return; } let mut x = m; let mut rest = n; let mut res = 0; while rest > 1 { res += x; x = (x + 1) / 2; rest -= 1; if x == 1 { break; } } res += rest; p!(res); return; }