#include<bits/stdc++.h>
using namespace std;
int main()
{
	double a,b;
	double c=6;
	cin>>a>>b;
	if(a>2&&a<=10) c+=(a-2)*1.8;
	else if(a>10) c+=14.4+(a-10)*2.7;
	c+=floor(b/3);
	cout<<c;
	return 0;
}