import java.util.Scanner;
class Main{
public static void main(String[]args){
Scanner sc=new Scanner(System.in);

int N =sc.nextInt();

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

int N =sc.nextInt();

if(N!=0){
     int ans =N/2;
     int answer=N%2;
     if(answer==0){
     System.out.println(ans);
     }else{
     System.out.println(ans+1);}
}else{
System.out.println(0);
}
}
} Main public static void main(String[]args){
Scanner sc=new Scanner(System.in);

int N =sc.nextInt();

if(N!=0){
     int ans =N/2;
     int answer=N%2;
     if(answer==0){
     System.out.println(ans);
     }else{
     System.out.println(ans+1);}
}else{
System.out.println(0);
}
} main {
Scanner sc=new Scanner(System.in);

int N =sc.nextInt();

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

int N =sc.nextInt();

if(N!=0){
     int ans =N/2;
     int answer=N%2;
     if(answer==0){
     System.out.println(ans);
     }else{
     System.out.println(ans+1);}
}else{
System.out.println(0);
}
}
}