#include<stdio.h>
int main()
{
    int paymentAmount,accountBalance,isActive;
    if(scanf("%f %f %d", &paymentAmount,&accountBalance,&isActive) !=3)
    {
        printf("Invalid input");
        return 0;
    }
    if(isActive !=1 && isActive !=0)
    {
        printf("Invalid inpnt");
        return 0;
    }
    if(isActive == 0)
    {
        printf("Account Inactive");
        return 0;
    }
    if (paymentAmount > accountBalance)
    {
        printf("Insufficient Balamce");
        return 0;
    }
    float remainingBalance = accountBalance - paymentAmount;
    printf("%.2f",remainingBalance);
    return 0;
    
}