#   include<stdio.h>
int main()
{
   int paymentamount, accountbalance, isactive;
   float r;
   
   scanf("%d",&paymentamount);
   scanf("%d",&accountbalance);
   scanf("%d",&isActive);
   if(paymentamount<=0 || accountbalance<=0 || isActive<1 || isActive>0)
   {
       printf("Invalid input");
   }
   else if(isActive==0)
   {
       printf("Account Inactive");
   }
   else if(paymentamount > accountbalance)
   {
       printf("Insufficient Balance");
   }
   else{
       r=accountbalance-paymentamount;
       printf("%.2f",r);
   }
   return 0;
}