#include<stdio.h>
int main()
{
    int paymentaccount,accountbalance,isactive;
    scanf("%d %d %d",&paymentaccount,&accountbalance,&isactive);
    if(isactive==0)
    {
        printf("account inactive");
    }
    else if"(paymentaccount > acountbalance)
    {
        printf("insufficient balance");
    }
    else
    {
        flot remaining balance=accountbalance-paymentaccount;
        printf ("%2f", remaningbalance);
    }
    return 0;
}