#include<stdio.h>
int main()
{
    int a,b,c;
    if(scanf("%d %d %d",&a,&b,&c)==3)
    {
        if(a<0 || b<0 || c<1)
        {
            printf("Invalid input\n");
        }
        else if (c==0)
        {
            printf("Account Inactive");
        }
        else if(b>=a)
        {
            float d=b-a;
            printf("%0.2f\n",d);
        }
        else
        {
            printf("Insufficient Balance\n")
        }
    {
    else
    {
        printf("Invalid input\n");
    }
    return 0;
}