UVa 11777 Automate the Grades Solution

#include<stdio.h>
int main()
{
int t,t1,t2,f,a,c1,c2,c3,i,avr,sum;
while(scanf("%d",&t)==1)
{
for(i=1;i<=t;i++)
{
scanf("%d%d%d%d%d%d%d",&t1,&t2,&f,&a,&c1,&c2,&c3);
if(c1<=c2 && c1<=c3)
avr=(c2+c3)/2;
else if(c2<=c1 && c2<=c3)
avr=(c1+c3)/2;
else if(c3<=c1 && c3<=c2)
avr=(c1+c2)/2;
sum=t1+t2+f+a+avr;
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);
}
}
}