#include <stdio.h>
 int main(){
     int paymentAmount,accountBalance,isActive;
     //read three inputs
     if(scanf("%d",&paymentAmount)!=1||
        scanf("%d",&accountBalance)!=1||
        scanf("%d",&isActive)!=1){
            printf("invalid input");
            return 0;
        }
        //validate values
        if (paymentAmount<0||accountBalance<0||
        (isActive !=0&&isActive !=1){
        printf("Invalid input");
        return 0;
        }
        //check account status
        if(isActive ==0){
            printf("Account Inactive");
            return 0;
        }
        //check balance
        if(paymentAmount>accountBalance){
            printf("Insufficient Balance");
            return 0;
        }
        //process payment
        float remaining=accountBalance-paymentAmount;
        printf("%.2f",remaining);
        return 0;
 }