Codechef Code Crunch 2013 ATM

ATM Problem code: MRIU11

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Problem description.

Pooja would like to withdraw X $US from an ATM. The cash machine will only accept the transaction if X is a multiple of 5, and Pooja's account balance has enough cash to perform the withdrawal transaction (including bank charges). For each successful withdrawal the bank charges 0.50 $US.
Calculate Pooja's account balance after an attempted transaction.

Input

Input description.

Positive integer 0 < X <= 2000 - the amount of cash which Pooja wishes to withdraw.

Nonnegative number 0<= Y <= 2000 with two digits of precision - Pooja's initial account balance.

Output

Output the account balance after the attempted transaction, given as a number with two digits of precision. If there is not enough money in the account to complete the transaction, output the current bank balance.

Example - Successful Transaction

Input:
30 120.00


Output:
89.50

Example - Incorrect Withdrawal Amount (not multiple of 5)

Input:
42 120.00


Output:
120.00

Example - Insufficient Funds

Input:
300 120.00


Output:
120.00

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include <map>
#include <queue>
#include <vector>
#include <string>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
#define maxn 10005
#define mod 1000000007
#define ll long long
#define INF 0x7fffffff
int n;
double m;
char s[maxn];
int main(){
    int cas = 1;
    int t;
    /*scanf("%d", &t);
    while (t--){
        scanf("%d", &n);
        printf("%I64d\n", f[n]);
    }*/
    while (~scanf("%d%lf", &n,&m)){
        if (n % 5 == 0&&n>5)printf("%.2lf\n", m - n - 0.5);
        else printf("%.2lf\n", m);
    }
    return 0;
}