import java.util.Scanner;
public class HELLOWORLD {
public static void main(String shit[])
{
Scanner sc=new Scanner(System.in);
System.out.println("请输入a的值");
int a=sc.nextInt();
while(a>100||a<0)
{
System.out.println("输入失败 请重新输入a:");
a=sc.nextInt();
}
System.out.println("请输入b的值");
int b=sc.nextInt();
while(b>100||b<0)
{
System.out.println("输入失败 请重新输入b:");
b=sc.nextInt();
}
System.out.println("请输入c的值");
int c=sc.nextInt();
while(c>100||c<0)
{
System.out.println("输入失败 请重新输入c:");
c=sc.nextInt();
}
double average=(a+b+c)/3.00;
System.out.println(average);
}
}