#include<stdio.h>
int main() {
    int w, b, s;
    scanf("%d %d %d", &w, &b, &s);
    if (s == 0) printf("Account Inactive\n");
    else if (w > b) printf("Insufficient Balance\n");
    else printf("5.2f\n", (double)b - w);
    return 0;
}