#include<stdio.h>
int main()
{
    int paymentAmount,accountBalance,isActive;
    
    if(scanf("%d", &paymentAmount) != 1 ||
       scanf("%d", &accountBalance) != 1 ||
       scanf("%d", &isActive) != 1{
       printf("Invalid input");
       
           return 0;
    }
    if(paymentAmount < 0 || paymentAccount > 1000000||
       amountBalance < 0 || accountBalance > 1000000||
       (isActive != 0 && isActive != 1)){
           printf("Invalid input");
           return 0;
       }
       if(paymentAmount > accountBalance){
           printf("Insufficient Balance");
           return 0;
       }
       float remaining = accountBalance - paymentAmount;
       prinf("%.2f",remaining);
       return 0;
       
}