04. Clever Lily

#include <iostream>
#include<string>
#include<map>

using namespace std;

int main() {
    int age;
    cin >> age;

    double mashinePrice, toyPrice;
    cin >> mashinePrice >> toyPrice;

    double sum = 0;
    int toyCount = 0;
    int birthdayCash = 0;

    for (int i = 1; i <= age; i++) {
        if (i % 2 == 0) {
            birthdayCash += 10;
            sum += birthdayCash - 1;
        }
        else {
            toyCount++;
        }
    }

    sum += toyCount * toyPrice;

    cout.setf(ios::fixed);
    cout.precision(2);

    if (sum >= mashinePrice) {
        cout << "Yes! " << sum - mashinePrice << endl;
    }
    else {
        cout << "No! " << mashinePrice - sum << endl;
    }

    return 0;
}