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));
}
}
}