#include <stdio.h>
int main()
{
    int paymentAmount, accountBalance, isActive;
    if (scanf("%d %d %d", &paymentAmount, &accountBalance, &isActive)! = 3)
    {
        printf("invalid input\n");
        return 0;
    }
    if (isActive == 0)
    {
        printf("Account inactive\n");
    }
    else if (paymentAmount > accountBalance)
    {
        printf("insufficient Balance\n");
    }
    else
    {
    float remaining = (float)(accountBalance - paymentAmount);
    printf("%.2f\n", remaining);
}
return 0;
}