package main;

import java.util.Arrays;
import java.util.Scanner;

public class Apro {
 static Scanner scan = new Scanner(System.in);
 static double a = scan.nextDouble();
 static double b = scan.nextDouble();
 static int n = scan.nextInt();
 static double[][] data = new double[2][n+1];
 static double h = (b - a) / n;
 static double x = scan.nextDouble();
 public static void main(String[] args) {
 makeData();

 System.out.println(L(x));
 System.out.println(P(x));
 System.out.println(f(x));

 }
 static void makeData() {
 data[0][0] = 1;
 data[1][0] = f(data[0][0]);
 for (int i = 1; i <= n; i++) {
 data[0][i] = data[0][i-1] + h;
 data[1][i] = f(data[0][i]);
 }

 }
 static double f(double x) {
 return x*x;
 }

 static double L(double x) {
 double answer = 0;
 for (int i = 0; i < n; i++) {
 double a = 1;
 for (int j = 1; j < n; j++) {
 if (j != i) a *= ((x - data[0][j]) / (data[0][i] - data[0][j]));
 }
 answer += (a * data[1][i]);
 }
 return answer;
 }
 public static double P(double x) {
 double result = data[1][0], P, den;
 for (int i = 1; i < n; i++) {
 P=0;
 for (int j = 0; j <= i; j++){
 den=1;
 for (int k = 0; k <= i; k++){
 if (k != j) den *= (data[0][j]-data[0][k]);
 }
 P += data[1][j]/den;
 }
 for (int k=0; k<i; k++)
 P *= (x-data[0][k]);
 result += P;
 }
 return result;
 }

}