import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int res = 0;
        if(a%2 == 0){
            res = a/2;
        }
        if(a%2 != 0){
            res = a/2 + 1;
        }
        System.out.println(res);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int res = 0;
        if(a%2 == 0){
            res = a/2;
        }
        if(a%2 != 0){
            res = a/2 + 1;
        }
        System.out.println(res);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int res = 0;
        if(a%2 == 0){
            res = a/2;
        }
        if(a%2 != 0){
            res = a/2 + 1;
        }
        System.out.println(res);
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int res = 0;
        if(a%2 == 0){
            res = a/2;
        }
        if(a%2 != 0){
            res = a/2 + 1;
        }
        System.out.println(res);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int res = 0; res 0 if(a%2 == 0){
            res = a/2;
        } a%2 == 0 a%2 a 2 0 {
            res = a/2;
        } res = a/2 res a/2 a 2 if(a%2 != 0){
            res = a/2 + 1;
        } a%2 != 0 a%2 a 2 0 {
            res = a/2 + 1;
        } res = a/2 + 1 res a/2 + 1 a/2 a 2 1 System.out.println(res) System.out.println System.out System System.out res String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int res = 0;
        if(a%2 == 0){
            res = a/2;
        }
        if(a%2 != 0){
            res = a/2 + 1;
        }
        System.out.println(res);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int res = 0;
        if(a%2 == 0){
            res = a/2;
        }
        if(a%2 != 0){
            res = a/2 + 1;
        }
        System.out.println(res);
    }
} Main
import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int res = 0;
        if(a%2 == 0){
            res = a/2;
        }
        if(a%2 != 0){
            res = a/2 + 1;
        }
        System.out.println(res);
    }
}