#include<bits/stdc++.h>
using namespace std ;
double x;
char a, b;
int main ( ) {
	cin >> x >> a >> b;
	if ((a == 'B' && b != 'C') || (b == 'B' && a != 'C')) {
		x *= 0.8;
	} else if ((a == 'C' && b != 'B') || (b == 'C' && a != 'B')) {
		x *= 0.7;
	} else if ((a == 'C' && b == 'B') || (b == 'C' && a == 'B')) {
		x *= 0.6;
	}
	cout << x;
	return 0;
}