When I run it why does it say can not find class BufferedReader?
package com.codegym.task.task05.task0507;
/*
Arithmetic mean
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int number = Integer.parseInt(reader.readLine());
int sum = 0;
int count = 0;
while (number != -1){
sum = number + sum;
count++;
}
if (number = -1) {
System.out.println(sum/count);
break;
} else {
}
}
}