#include<stdio.h>
int main()
{
    int paymentamount,accountbalance,isactive;
    if(scanf("%d",&paymentamount)!=1||
    scanf("%d",&accountbalance)!=1||
    scanf("%d",&isactive)!=1)
    {
        printf("invalid input");
        return 0;
    }
    if(isactive==0)
    {
        printf("account inactive");
    }
    else if(paymentamunt>accountbalance)
    {
        print("Insufficient balance");
    }
    else
    {
        float remainingbalance-accountbalance-paymentamount;
        printf("%.2f",remainingbalance);
    }
    return 0;
}