//Java
import java.util.Scanner;

class uva10696{
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		int number;
		while((number=sc.nextInt())!=0){
			System.out.println("f91("+number+") = "+f91(number));
		}
	}
	public static int f91(int number){

		if(number<=100)
			return f91(f91(number+11));
		else
			return number-10;

	}
}