// PROGRAM TO INPUT ONE NUMBER AND CHECK IF IT IS A PERFECT NUMBER
import java.io.*;
public class perfectnumber
{
public static void main (String [] args ) throws IOException
{
BufferedReader br=new BufferedReader (new InputStreamReader(System.in));
System.out.println("ENTER NUMBER");
String str1=br.readLine();
int num=Integer.parseInt(str1);
int sum=0;
for(int i=1;i<num;i++)
{
if((num%i)==0)
{
sum=sum+i;
}
}
if(sum==num)
{
System.out.println(num+" IS A PERFECT NUMBER");
}
else
{
System.out.println(num+" IS NOT A PERFECT NUMBER");
}
}
}
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