#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
//#define endl '\n'
#define boostIO() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
ll gcd(ll a, ll b) { return (b == 0 ? a : gcd(b, a % b)); }

double f(double x) {
    return (3 * x - 6) / sqrt(x * x - 4 * x + 5);
}

signed main() {

    vector<double> y(7);
    double a = -1;
    double b = 1;

    for (int i = 0; i <= 6; ++i) {
        double x = a + (b - a) * i / 6;
        y[i] = f(x);
        cout << "f(" << x << ") = " << y[i] << endl;
    }

    {
        double sum = 0;
        for (int i = 1; i < 6; ++i) sum += y[i];
        double I = (b - a) / 6 * (accumulate(all(y), 0.0) - (y[0] + y[6]) / 2);
        cout << "I = " << I << endl;
        double del = fabs(-5.2442 - I);
        cout << "d = " << del << endl << endl;
    }
    {
        double q1 = 0, q2 = 0;
        for (int i = 1; i < 6; i += 2) q1 += y[i];
        for (int i = 2; i < 6; i += 2) q2 += y[i];
        double I = (b - a) / (3 * 6) * (y[0] + y[6] + 4 * q1 + 2 * q2);
        cout << "I = " << I << endl;
        double del = fabs(-5.2442 - I);
        cout << "d = " << del << endl << endl;
    }
    {
        vector<double> t(5), A(5);
        t[4] = 0.906179846;
        t[3] = 0.538469310;
        t[2] = 0;
        t[1] = -t[3];
        t[0] = -t[4];
        A[0] = A[4] = 0.236926885;
        A[1] = A[3] = 0.478628670;
        A[2] = 0.568888889;

        double sum = 0;
        for (int i = 0; i < 5; ++i) {
            double cur = A[i] * f((a + b) / 2 + (b - a) / 2 * t[i]);
            sum += cur;
        }

        double I = (b - a) / 2 * sum;
        cout << "I = " << I << endl;
        double del = fabs(-5.2442 - I);
        cout << "d = " << del << endl;

    }
}