#include<bits/stdc++.h>
using namespace std;
long long f91(int n)
{
if(n<=100)return f91(f91(n+11));
else return n-10;
}
int a[1000001],i=0;
int main()
{
while(1)
{
cin>>a[++i];
if(a[i]==0)
{
i--;break;
}
}
for(int j=1;j<=i;j++)
{
cout<<"f91("<<a[j]<<") = "<<f91(a[j])<<endl;
}

return 0;
}