#include <bits/stdc++.h>
using namespace std;
int main()
{
	long long n;
	char a,b;
	cin >> n >> a >> b;
	if (a != 'B' && a != 'C' && b != 'B' && b != 'C')
		cout << n;
	else if ((a == 'B' && b != 'C') || (b == 'B' && a != 'C'))
		cout << n * 0.8;
	else if ((a == 'C' && b != 'B') || (b == 'C' && a != 'B'))
		cout << n * 0.7;
	else if ((a == 'B' && b == 'C') || (a == 'C' && b == 'B'))
		cout << n * 0.6;
}

帮蒟蒻看看吧，有问题@一下谢谢啦