#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    double a,b,c; cin >> a >> b >> c;

    if(b * b - 4 * a * c == 0)
    {
        cout << "x1 = x2 = " << (-b) / (2 * a) << endl;
    }

    else if(b * b - 4 * a * c > 0)
    {
        cout << "x1 = " << (-b + sqrt(b * b - 4 * a * c)) / (2 * a);
        cout << "x2 = " << (-b - sqrt(b * b - 4 * a * c)) / (2 * a);
    }

    else
    {
        cout << "x1 = " << (-b) / (2 * a) << " + " << sqrt(-(b * b - 4 * a * c)) / (2 * a) << "i" << endl;
        cout << "x2 = " << (-b) / (2 * a) << " - " << sqrt(-(b * b - 4 * a * c)) / (2 * a) << "i" << endl;
    }

    return 0;
}

#include <iostream>

using namespace std;

bool is_prime(int num)
{
    bool flag = true;

    for(int i = 2; i < num; i++)
    {
        if(num % i == 0)
        {
            return false;
        }
    }

    return true;
}

int main()
{
    int num; cin >> num;

    cout << is_prime(num) << endl;

    return 0;
}

#include <iostream>

using namespace std;

int func(int n)
{
    if(n == 1)
    {
        return 1;
    }

    else
    {
        return n * func(n - 1);
    }
}

int main()
{
    int a,b,c; cin >> a >> b >> c;

    cout << func(a) + func(b) + func(c) << endl;

    return 0;
}

#include <iostream>
#include <cmath>

using namespace std;

double e(double x)
{
    return exp(x);
}

double sinh(double x)
{
    return (e(x) - e(-x)) / 2;
}

int main()
{
    double x; cin >> x;

    cout << sinh(x) << endl;

    return 0;
}