#include<stdio.h>
int main()
{
    int p,b,a;
    if(scanf("%d%d%d",&p,&b,&a)!=)
    if(p,b,a!=3)
    printf("Invalid input");
    else if(!a)
      printf("Account inactive");
    else if(p>b)
      printf("Insufficient Balance");
    else
      printf("%0.2f",(float)(b-p));
     return 0;
}