#include<iostream>
using namespace std;
int main()
{
int a,b,sum,t;
cin>>a>>b;
sum=a*10+b;
t=sum/19;
cout<<t<<endl;
return 0;
}
#include<iostream>
using namespace std;
int main()
{
int a,b,sum,t;
cin>>a>>b;
sum=a*10+b;
t=sum/19;
cout<<t<<endl;
return 0;
}