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