Problem:
Score : 200 points

Problem Statement

Takahashi loves numbers divisible by 2.

You are given a positive integer N. Among the integers between 1 and N (inclusive), find the one that can be divisible by 2 for the most number of times. The solution is always unique.

Here, the number of times an integer can be divisible by 2, is how many times the integer can be divided by 2 without remainder.

For example,

6 can be divided by 2 once: 6 -> 3.

8 can be divided by 2 three times: 8 -> 4 -> 2 -> 1.

3 can be divided by 2 zero times.

Constraints

1 ≤ N ≤ 100

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer.

Sample Input 1

7

Sample Output 1

4

4 can be divided by 2 twice, which is the most number of times among 1, 2, ..., 7.

Sample Input 2

32

Sample Output 2

32

Sample Input 3

1

Sample Output 3

1

Sample Input 4

100

Sample Output 4

64

Solution in Go (1.14.1) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)

func contains(target string, list []string) bool {
	for _, r := range list {
		if target == r {
			return true
		}
	}
	return false
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	sc.Scan()

	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func nextF64() float64 {
	sc.Scan()

	i, e := strconv.ParseFloat(sc.Text(), 64)
	if e != nil {
		panic(e)
	}
	return i
}

func isInteger(x float64) bool {
	return math.Floor(x) == x
}

func Ave(s []int) int {
	val := 0
	for _, i := range s {
		val += i
	}
	return int(val / len(s))
}
func cal(i int) (sum int) {
	for i != 0 {
		sum += i % 10
		i /= 10
	}
	return
}
func max(a []int) (idx int, val int) {
	max := a[0]
	idx = 0
	for j, i := range a {
		if max < i {
			max = i
			idx = j
		}
	}
	return idx, max
}

func draw(i int, a []int) (l []int) {
	// p = a[i]
	for j := i; j < len(a); j++ {
		if j != len(a)-1 {
			a[j] = a[j+1]
		} else if j == len(a)-1 {
			a = a[:len(a)-1]
		}
	}
	return a
}

func main() {
	sc.Split(bufio.ScanWords)
	// sc.Buffer([]byte{}, math.MaxInt64)
	// a := make([][]int, 3)
	// for i := 0; i < 3; i++ {
	// 	a[i] = make([]int, 3)
	// }
	// for i := 0; i < 3; i++ {
	// 	for j := 0; j < 3; j++ {
	// 		a[i][j] = nextInt()
	// 	}
	// }

	n := nextInt()

	var out int
	var ans int

	if n == 1 {
		ans = 1
	}

	for i := 2; i <= n; i++ {
		if i%2 == 0 {
			cnt := 0
			for j := i; j%2 == 0; {
				j = j / 2
				cnt++
			}
			if cnt > out {
				out = cnt
				ans = i
			}

		}

	}

	fmt.Println(ans)

}