uva10696

#include<stdio.h>
int main()
{
    int N,a;
    while(scanf("%d",&N)==1&&N!=0)
    {
        if(N<=100)
        {
           a=91;
        }
        else
        {
            a=N-10;
        }
        printf("f91(%d) = %d\n",N,a);




    }
    return 0;




}