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 JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

function main(input) {
  const args = input.split(' ');
  const N = parseInt(args[0], 10);
  
  if (N % 2 == 0) {
    console.log(N / 2);
  } else {
    console.log(Math.ceil(N / 2));
  }
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));