#include<stdio.h>
int main()
{
    int a,b;
    float c;
    scanf("%d\n%d\n",&a,&b);
    c=b-a;
    if(c>0)
    {
        printf("%.2f",c);
    }   
        else
        {
        printf("Insufficient Balance");
        break;
        }
    return 0;
}