#include <iostream>

using namespace std;

long f91(int n)
{
    if( n >= 101 )
        return n - 10;
    else
        return 91;
}

int main()
{
    int n;
    while( cin >> n )
    {
        if( n == 0 )
            break;
        long result = f91(n);
        cout << "f91(" << n << ") = " << result << endl;
    }

    return 0;
}