Student grade Calculation Console using Java

Input the Student name,marks for 3 subjects,calculate the avg,grade. In order to calculate the grade using following conditions.

Avg <=100 to > 80 -> Distintion

Avg <=80 to > 70 -> Credit

Avg <=70 to > 60 -> Simple Pass

Avg <=60 to >= 0 -> Fail

Other wise invalid Average

public class JavaEx {

    public static void main(String args[]) {
        String employeename = "James";

        int maths = 90;
        int english = 80;
        int science = 68;

        int tot = maths + english + science;

        double avg = tot/3;

        if(avg <= 100  && avg > 80)
        {
            System.out.println("Distintion");
        }
        else if(avg <= 80  && avg > 70)
        {
            System.out.println("Credit");
        }
        else if(avg <= 70  && avg > 60)
        {
            System.out.println("Simple Pass");
        }
        else if(avg <= 60  && avg > 0)
        {
            System.out.println("Fail");
        }
        else
        {
            System.out.println("Invalid Average");
        }

    }

}