#include<stdio.h>
#include<ctype.h>
int main()
{
    float paymentAmount, accountBalance;
    int isActive;
    if(scanf("%f %f %d", &paymentAmount, &accountBalance, &isActive) !=3)
    {
        printf("Invalid input\n");
        return 0;
    }
    if(paymentAmount<0||accountBalance<0||(isActive !=0 && isActive !=1))
    {
        printf("Account Inactive\n");
        return 0;
        if(isActive==0)
        {
            printf("Account Inactive\n");
            return 0;
            
        }
         if (paymentAmount>accountBalance)
         {
            printf("Insufficient Balance");
            return 0;
         }
        float remain = accountBalance - paymentAmount;
        printf("%.2f\n",remain);
        return 0;
    }