#include<stdio.h>
int main()
{
    int paymentAmount,accountAmount,isActive;
    scanf("%d %d %d", &payAmount, &accountBalance, &isActive);
    if(!isActive){
        printf("Account inactive");
    }
    else if(accountBalance<paymentAmount)
    {
    printf("Insufficient balance");
        
    }
    else
    {
    float remainingBalance=accountBalance-paymentAmount;
    printf("%.2f",remainingBalance);
}
return 0;
}