//普通方法
import java.util.Scanner;
public class Main {
public static void n(int num){
int Sn = 0;
int sum = 1;
int M=0;
for(int i = 0;i<num;i++){
if(i!=0){
sum = sum*10;
Sn = Sn+2*sum;
M+=Sn;
}else{
Sn = Sn+2;
M+=Sn;
}
}
System.out.print(M);
}
public static void main(String[] arg){
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
n(num);
}
}
//API方法
import java.util.Scanner;
public class Main {
public static void n(int num){
int Sn = 0;
int M=0;
for(int i=0;i<num;i++ ){
Sn = (int) (Sn +2*Math.pow(10, i));
M+=Sn;
}
System.out.print(M);
}
public static void main(String[] arg){
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
n(num);
}
}
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