直接算。

int main()
{
    int n,i;
    scanf("%d", &n);
    double sum = n,tmp = n;
    for(i=1; i < 5; i++)
    {
        tmp = tmp/2;
        sum += tmp*2;
    }
    double last = tmp/2;
    printf("%.6f\n",sum);
    printf("%.6f\n",last);
}