[UVa] 10696 f91.cpp

#include <cstdio>
using namespace std;
int fn[101]={0};

int f91 (int N){
    if (N > 100) return N-10;
    if (fn[N] != 0) return fn[N];
    fn[N] = f91(f91(N+11));
    return fn[N];
}

int main()
{
    int n;
    while (scanf("%d",&n)){
        if (!n) break;
        printf("f91(%d) = %d\n",n,f91(n));
    }
    return 0;
}