#include<stdio.h>
int main(){
    double payamount,accbal;
    int isactive;
    if(scanf("%lf %lf %d",&payamount,&accbal,&isactive) !=3){
        printf("Invalid input");
        return 0;
    }
    if(payamount<0||payamount>1000000||accbal>1000000||(isactive!=0 && isactive!=1)){
        printf("Invalid input\n");
        return 0;
    }
    if (isactive==0){
        printf("Account Inactive\n");
        return 0;
    }
    if(payamount>accbal){
        printf("Insufficient Balance\n");
        return 0;
    }
    double rembal=accbal-payammount;
    printf("%.2f\n",rembal);
    return 0;
}