import java.util.Scanner;

public class GCD {

    public static int f(int n){
        if(n>=101) return n-10;
        else  return f(f(n+11));
    }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        while(true){
            int n = input.nextInt();
            if(n==0) break;
            System.out.format("f91(%d)"+" = " +"%d%n", n,f(n));
        
        }
    }

}