#include<stdio.h>
int main()
{
    int a;
    int b;
    int 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 if
        {
            printf("Insuffient Balance\n");
        }
        else{
            printf("Invalid input\n");
        }
        return 0;
    }
}