/*recurrsion math*/






#include<iostream>
#include<cstring>

using namespace std;
int n=0,ans=0;

int main(void) {

 while (cin >> n)
 {
  if (n == 0)break;

  //regular
  if (n <= 101) ans = 91;
  else ans = n - 10;

  cout <<"f91("<<n<<") = "<< ans << endl;
 }

 system("PAUSE");
}