int main(int argc, char* argv[])
{
    double e;

    puts(
         );

    
    
    e = exp(1);
    printf(, e);

    
    
    int n = 8192;
    e = 1.0 + 1.0 / n;
    for (int i = 0; i < 13; i++)
        e *= e;
    printf(, e);

    
    
    
    const int N = 1000;
    double a[1000];
    a[0] = 1.0;
    for (int i = 1; i < N; i++)
    {
        a[i] = a[i-1] / i;
    }
    e = 1.;
    for (int i = N - 1; i > 0; i--)
        e += a[i];
    printf(, e); 

    return 0;
}