#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("Invaild Input\n");
    }
    else if(isactive==0)
    {
        printf("Account Inactive\n");
    }
    else if(paymentamount>accountbalance);
    {
        printf("Insufficient Balance\n");
    }
    else
    {
        r=(float)accountbalance-paymentamount;
        printf("%.2f",r);
    }
}