#include <bits/stdc++.h>
using namespace std;

int main(){
	long long a;
	char x,y;
	cin >>a >>x >>y;
	long long ans;
	if((x=='B'&&y=='C') || (x=='C'&&y=='B'))ans=a*6/10;
	else if((x=='B'&&y=='A') ||(x=='A'&&y=='B'))ans=a*8/10;
	else if((x=='C'&&y=='A') ||(x=='A'&&y=='C'))ans=a*7/10;
	else ans=a;
	cout <<ans;
	return 0;
}