#include<stdio.h>
int main()
{
    int a,b;
    float c;
    scanf("%d\n %d\n",&a,&b);
    scanf("%f\n",&c)
    c=b-a;
    if(c>1)
    {
        printf("%.2f\n",c);
    }
    else
    {
        printf("Insufficient Balance");
        
    }
    return 0;
}