import java.util.Scanner;
public class Admin {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int x = in.nextInt();
int y = x;
if (x >= 1 && x < 10) {
y = 3 * x - 2;
} else if (x >= 10) {
y = 4 * x;
}
System.out.println(y);
}
}
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