#include<stdio.h>
int main(){
    int w;
    float b;
    int s;
    scanf("%d",&w);
    scanf("%d",&b);
    scanf("%d",&s);
    if(s==0){
        printf("Account Inactive");
    }
    else if(w>b){
        printf("Insufficient balance");
    }
    else{
        printf("%.2f",b-w);
    }
    return 0;
}