#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<=0 || isActive>1)
   {
       printf("Invalid input");
   }
   ele if(isActive==0)
   {
       printf("Account Inactive");
   }
   else if(paymentAmount>accountBalance)
   {
       printf("Insufficient Balance");
   }
   else
   {
       r=accountBalance-paymentAmount;
       printf("%.2f",r);
   }
   return 0;
}