p1) f91

#include<bits/stdc++.h>
#define all(x) x.begin(), x.end()
#define pb(x) push_back(x)
#define N 100005

using namespace std;

int f91(int n){

    if(n >= 101)return n - 10;
    return f91(f91(n + 11));
}

int main(){

    int n;
    while(scanf("%d", &n) == 1){

        if(n == 0)break;
        printf("f91(%d) = %d\n", n, f91(n));

    }

}