#include<bits/stdc++.h>
using namespace std;
int main()
{
	long long x;
	char a,b;
	cin>>x>>a>>b;
	if(a=='A'&&b=='B'||a=='B'&&b=='A'||a=='B'&&b=='B')
		cout<<x/8*10;
	else if(a=='C'&&b=='A'||a=='A'&&b=='C'||a=='C'&&b=='C')
		cout<<x/7*10;
	else if(a=='C'&&b=='B'||a=='B'&&b=='C')
		cout<<x/6*10;
	else if(a=='A'&&b=='A')
		cout<<x;
	return 0;
}