#include <stdio.h>

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