import java.util.Scanner;
public class Main {
public static void main(String[] args) {
int a;
int b;
int c;
Scanner in=new Scanner(System.in);
a=in.nextInt();
if(a<30) {
c=a50;
System.out.println©;
}else {
c=a48;
System.out.println©;
}
}
}