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