Solution.java:25: error: cannot find symbol BufferedReader br=new BufferedReader(new InputStreamReader(in)); ^ symbol: variable in location: class Solution 1 error

MYcode:

import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.; import java.lang.reflect.; class Prime{ void checkPrime(int... a) { int flag = 0; for(int i=0;i

public static void main(String[] args) {
    try{
    BufferedReader br=new BufferedReader(new InputStreamReader(in));
    int n1=Integer.parseInt(br.readLine());
    int n2=Integer.parseInt(br.readLine());
    int n3=Integer.parseInt(br.readLine());
    int n4=Integer.parseInt(br.readLine());
    int n5=Integer.parseInt(br.readLine());
    Prime ob=new Prime();
    ob.checkPrime(n1);
    ob.checkPrime(n1,n2);
    ob.checkPrime(n1,n2,n3);
    ob.checkPrime(n1,n2,n3,n4,n5);  
    Method[] methods=Prime.class.getDeclaredMethods();
    Set<String> set=new HashSet<>();
    boolean overload=false;
    for(int i=0;i<methods.length;i++)
    {
        if(set.contains(methods[i].getName()))
        {
            overload=true;
            break;
        }
        set.add(methods[i].getName());

    }
    if(overload)
    {
        throw new Exception("Overloading not allowed");
    }
    }
    catch(Exception e)
    {
        System.out.println(e);
    }
}

}