#include <iostream>
using namespace std;

int f91(int theinput);

int main()
{
	int input;
	int output;
	while(cin>>input)
	{
		if(input!=0)
		{
			output = f91(input);
			cout<<"f91("<<input<<") = "<<output<<endl;
		}
		else
			break;
	}

	return 0;
}

int f91(int theinput)
{
	if(theinput>=101)
		return theinput-10;
	else
		return f91(f91(theinput+11));
}