#include<stdio.h>
int main(){
    int a,b,c;
scanf("%d %d %d", &a,&b,&c);
    
    if(!c) {
        printf("Account Inactive");
    }else if (a>b){
        printf("insufficient balance");
        
    } else { 
        printf("%.2f",b-a*1.0);
    }
    return 0
}