#include<stdio.h>
int main()
{
    float paymentAccount,accountBalance;
    int isActive;
    if (scanf("%f %f %d", &paymentAccount, &accountBalance, &isActive) !=3)
    {
        printf("Invalid input");
        return 0;
    }
    if (paymentAmount < 0 || accountBalance < 0||(isActive !=0 && isActive !=1))
    {
        printf("Invalid input");
        return 0;
    }
    if(isActive==0)
    {
        printf("Account Inactive\n");
        return 0;
    }
    if (paymentAmount > accountBalance)
    {
        printf("Insufficient Balance\n");
        return 0;
    }
    float remainingBalance = accountBalance - paymentAmount;
    printf("%0.2\n", remainingBalance);
    return 0;
}