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

#include<iostream>
using namespace std;
int main()
{
int a,b,c=19,d;
cin>>a>>b; 
a=a*10+b;
while(a)
{
	a=a/c;
	d+=1;
}
cout<<d<<endl;
return 0;
}