// editor2
#include<stdio.h>
void main()
{
    int amount,balance,active;
    scanf("%d\n",&amount);
    scanf("%d\n",&balance);
    scanf("%d\n",&active);
    if(amount>balance && active==0)
    {
        printf("Insufficient Balance");
    }
    else if(amount>balance||active==1)
    {
        float remainingBalance=balance-amount;
        printf("%.2f\n",remainingBalencene);
    }
}