Problem:
Score : 100 points

Problem Statement

Takahashi wants to print a document with N pages double-sided, where two pages of data can be printed on one sheet of paper.

At least how many sheets of paper does he need?

Constraints

N is an integer.

1 \leq N \leq 100

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer.

Sample Input 1

5

Sample Output 1

3

By printing the 1-st, 2-nd pages on the 1-st sheet, 3-rd and 4-th pages on the 2-nd sheet, and 5-th page on the 3-rd sheet, we can print all the data on 3 sheets of paper.

Sample Input 2

2

Sample Output 2

1

Sample Input 3

100

Sample Output 3

50

Solution in Go (1.6) (judge verdict: Accepted)

package main

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

var sc = bufio.NewScanner(os.Stdin)

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

func main() {
     sc.Split(bufio.ScanWords)
     n := nextInt()
     ans := n / 2 + n % 2
     
     fmt.Println(ans)
}