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