UVA 11777 - Automate the Grades -Solution

#include<stdio.h>
int main()
{
    int t,t1,t2,f,a,c1,c2,c3,i=1,avg,sum;
    scanf("%d",&t);
    while (t--)
    {
        scanf("%d%d%d%d%d%d%d",&t1,&t2,&f,&a,&c1,&c2,&c3);
        if (c1<=c2 && c1<=c3)
            avg=(c2+c3)/2;
        else if (c2<=c1 && c2<=c3)
            avg=(c1+c3)/2;
        else if (c3<=c1 && c3<=c2)
            avg=(c1+c2)/2;
        sum=t1+t2+f+a+avg;
        if(sum>=90)
            printf("Case %d: A\n",i++);
        else if(sum>=80)
            printf("Case %d: B\n",i++);
        else if(sum>=70)
            printf("Case %d: C\n",i++);
        else if(sum>=60)
            printf("Case %d: D\n",i++);
        else if(sum<60)
            printf("Case %d: F\n",i++);
    }
    return 0;
}