#include<stdio.h>
int main(){
   float paymentAmount,accountBalace;
   int isActive;
   if(scanf("%f %f %d",&paymentAmount,&accountBalace,&isActive)!=3){
       printf("Invalide input");
       return 0;
       
   }
   if(isActive==0){
       printf("Account Inactive");
       return 0;
       
   }
   if(paymentAmount > accountBalance){
       printf("Insufficient Balace");
       return 0;
       
   }
   float remainingBalance = accountBalance -paymentAmount;
   printf("%.2f",remainingBalance);
   
   return 0;
}