#include<stdio.h>
int main ()
{
    float paymentAmount,accountBalance,remaining;
    int isActive;
    scanf("%f\n%f\n", &paymentAmount, &accountBalance);
    scanf("%d", &isActive);
    if(isActive==0)
    {
        printf("Account Inactive");
    }
    else if(isActive==1)
    {
        remaining = accountBalance - paymentAmount;
        printf("%0.2f",remaining);
    }
    else if(isalpha(paymentAmount),isalpha(accountBalance))
    {
        printf("Invalid input");
    }
    return 0;
    
}