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 Java (OpenJDK 11.0.6) (judge verdict: Runtime Error)

import java.util.ArrayList;
import java.util.*;
import java.lang.*;
//import java.lang.*;
import java.util.regex.*;
public class Main{
     public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
     List<Integer> l=new ArrayList<>();
     List<Integer> search=new ArrayList<>();
     for(int i=0;i<3;i++){
         for(int j=0;j<3;j++)
            l.add(sc.nextInt());
     }
     Collections.sort(l);
   int n=sc.nextInt();
   for(int i=0;i<n;i++)
      search.add(sc.nextInt());
   
   Collections.sort(search);
   
   for(int i=0;i<search.size();i++){
         if(l.contains(search.get(i))){
            System.out.println("Yes");
            System.exit(0);
         }else continue;
   }  
   System.out.println("NO");
   System.exit(0);
   }
}