// editor2
#include<stdio.h>
int main(){
    int a,b;
    float c;
    scanf("%d\n%d",&a,&b);
    switch(c=b-a)
    {
        case 1:
        printf("%.2f",c);
        break;
        case 2:
        printf("Insufficient Balance");
        break;
    }
    return 0;
}