#include<stdio.h>
#include<ctype.h>
void main()
{
    int pa,ab,ia;
    float z;
    scanf("%d %d %d",&pa,&ab,&ia);
    if(isalpha(pa) || isalpha(ab) || isalpha(ia));
        {
            printf("Invalid input");
        }
    else if(ia==0)
        {
            printf("Account Inactive");
        }
    else if(ab<pa);
        {
        printf("Insufficient Balance");
        }
    else 
    {
        z=ab-pa;
    printf("%.2f",z);
    }
}