import java.util.Scanner;
public class Final {
void printfSumAndAverage(){
final int CLASS_CNT = 3;
Scanner input = new Scanner(System.in);
System.out.println("Input 3 numbers");
double num1 = input.nextDouble();
double num2 = input.nextDouble();
double num3 = input.nextDouble();
double sum = num1 + num2 + num3;
System.out.println("sum : " + sum);
double avr = (num1 + num2 + num3) / CLASS_CNT;
System.out.println("avr : " + avr);
}
}