Student Exam Grade System

This is the Tested code for the Student Exam System to Find the Appropriate Grade for the Given Marks Using the Code Java and IDE http://netbeans.org

/*
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*/
package salarytax;

import java.util.Scanner;

/**
*
* @author saeed
*/
public class GradeSystem {
public static void main(String args[]){
int[] marks = new int[5];
int sum=0;
String grade="null";
Scanner scan=new Scanner(System.in);
//Read Data
for(int i=0;i<marks.length;i++){
System.out.print("Enter the Marks for Subject # "+(i+1)+"___");
marks[i]=scan.nextInt();
sum=sum+marks[i];
}
double per=(double)sum/500*100;
if(per<33){
grade="Fail";
}else if((per>=33)&&(per<50)){
grade="D Grade";
}else if((per>=50)&&(per<60)){
grade="C Grade";
}else if((per>=60)&&(per<70)){
grade="B Grade";
}else if((per>=70)&&(per<80)){
grade="A Grade";
}else if((per>=80)&&(per<90)){
grade="A+ Grade";
}else if(per>=90){
grade="Cheater Kute";
}
System.out.println("\nYour Total Marks "+sum);
System.out.println("Your Average "+per);
System.out.println("Your are "+grade);

}
}