void theta(int num)
{
    if(num > 0)
    {
        printf("1\n");
    }
    else if(num == 0)
    {
        printf("0.5\n");
    }
    else
    {
        printf("0\n");
    }
}

int main()
{
    int a;
    while(scanf("%d",&a) != EOF)
    {
        getchar();
        theta(a);
    }
    return 0;
}