#include<iostream>
using namespace std;

int f91( int N )
{
    if( N <= 100 )
        return f91( f91( N+11 ) );
    else
        return N-10;
}

int main()
{
    int N;
    while( cin >> N && N != 0 )
        cout << "f91(" << N << ") = " << f91(N) << endl;
    return 0;
}