#include <stdio.h>
int main() {
int paymentAmount, accountBalance, isActive;
if (scanf("%d %d %d", &paymentAmount, &accountBalance, &isactive) != 3) {
    printf("Invalid input\n");
    return 0;
}
if (isActive == 0) {
    printf("Account inactive\n");
}
else if (paymentAmount > accountBalance) {
    printf("Insufficient Balance\n");
}
else {
    float remaining = (float)(accountBalance - paymentAmount);
    printf("%.2f\n",remaining);
}
return 0;
}