#include<iostream>
using namespace std;
int main()
{
    int n, t, j;
    double h, b, a, x, f, min, max;
    cout << "enter n = ";
    cin >> n;
    cout << "enter h = ";
    cin >> h;
    cout << "enter b = ";
    cin >> b;
    for (t = 1;t <= 3;t++)
    {
        cout << "enter a" << t << " = ";
        cin >> a;
        j = 1;
        x = b + j * h;
        f = ((1 - a) / (1 + x * x))*sin(a*a + a * x + 2);
        min = f;
        max = f;
        for (j = 2;j <= n;j++)
        {
            x = b + j * h;
            f = ((1 - a) / (1 + x * x))*sin(a*a + a * x + 2);
            if (f < min)
                min = f;
            if (f > max)
                max = f;
        }
        cout << "fi = " << min << endl;
        cout << "psi = " << max << endl;
    }
}