#include<stdio.h>
int main()
{
    int isActive;
    float paymentAmount,accountBalance;
    scanf("%f", &paymentAmount);
    scanf("%f", &accountBalance);
    scanf("%d", &isActive);
    if(isActive!=0 && isActive!=1)
    {
        printf("invalid input\n");
    }
    else if(isActive==0)
      {
            printf("Account Inactive\n");
      }
    else if(paymentAmount>accountBalance)
        {
           float remainingBalance=accountBalance-paymentAmount;
            printf("%.2f\n",remainingBalance);
        }
}
 return 0;