#include<stdio.h>
int num[10],credit[10]={0,3,3,3,3,2,2,2,1.5,0};
float gp[10],temp[10],total_credit=0.0,total_gp=0.0;
void input()
{
    printf("ENTER THE NUMBER OF DISCRETE MATHMATICS : \n");
    scanf("%d",&num[1]);
        printf("ENTER THE NUMBER OF ELECTRONICS-I : \n");
    scanf("%d",&num[2]);
        printf("ENTER THE NUMBER OF ENG. PHYSICS-II : \n");
    scanf("%d",&num[3]);
        printf("ENTER THE NUMBER OF ENG. MATHMATICS : \n");
    scanf("%d",&num[4]);
        printf("ENTER THE NUMBER OF DEVELOPING ENGLISH SKILL : \n");
    scanf("%d",&num[5]);
        printf("ENTER THE NUMBER OF STRUCTURED PROGRAMMING : \n");
    scanf("%d",&num[6]);
        printf("ENTER THE NUMBER OF STRUCTURED PROGRAMMING LAB : \n");
    scanf("%d",&num[7]);
        printf("ENTER THE NUMBER OF ELECTRONICS LAB : \n");
    scanf("%d",&num[8]);
}
float gpa(int num)
{
    if(num>=80)return 4.00;
    else if(num>=75&&num<=79)return 3.75;
        else if(num>=70&&num<=74)return 3.50;
        else if(num>=65&&num<=69)return 3.25;
            else if(num>=60&&num<=64)return 3.00;
                else if(num>=55&&num<=59)return 2.75;
                    else if(num>=50&&num<=54)return 2.50;
                        else if(num>=45&&num<=49)return 2.25;
                            else if(num>=40&&num<=44)return 2.00;

}
void calculation()
{
    int i=0,number;
    for(i=1;i<=8;i++)
    {
    number=num[i];
    gp[i]=gpa(number);
    temp[i]=gp[i]*credit[i];
    total_credit=total_credit+credit[i];
    total_gp=total_gp+temp[i];
    }
}
void result()
{
    printf("%.2f",total_gp/total_credit);
}
int main()
{
    input();
    calculation();
    result();
}