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

小脑萎缩了