#include<stdio.h>

int main() {
    long long paymentAmount, accountBalance;
    int isActive;

if (scanf("%lld", &paymentAmount) != 1 ||
    scanf("%lld", &accountBalance) != 1 
    ||
    scanf("%d", &isActive) != 1) {
        printf("Invalid input");
        return 0;
    }
    if (paymentAmount < 0 || paymentAmount > 1000000 ||
    accountBalance < 0 || accountBalance > 1000000 ||
    (isActive != 0  && isActive != 1)) {
    if (isActive == 0) {
        printf("Account inactive");
        return 0;
    }
    if (paymentAmount > accountBalance) {
        printf("Insufficient Balance");
        return 0;
    }
    double remaining = (double)accountBalance - paymentAmount;
    printf("%.2f", remaining);