#include<stdio.h>
int main()
{ 
    float paymentAmount, accountBlance;
    int isActive;
    if(scanf("%f %f %d",&paymentAmount,&accountBlance,&isActive)!=3) {
        printf("Invalid input");
        return 0;
    }
    if(paymentAmount < 0 || paymentAmount > 1000000 || accountBlance < 0 || accountBlance > 1000000 ||(isActive != 0 && isActive != 1)
    {
        printf("Invalid input");
        return 0;
    }
    if(isActive == 0)
    {
        printf("Account Inacfficieng");
    }
    else {
        float remainingBlance - accountBalsnce - paymentAmount;
        printf("%.2f", remainingBalance);
    }
    return 0;
    }