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 v5.12) (judge verdict: Accepted)

process.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data', v => {
    var tmp = Number(v.split("\n")[0]);
    if(tmp % 1 === 0 && 0<tmp<100 && tmp % 2 !== 0 ) {
        console.log((tmp + 1) / 2);
    }
    else if(tmp % 2 === 0 && 0<tmp<100 && tmp % 2 === 0) {
        console.log(tmp / 2);
    } else {
        console.log();
    }
});