#include <iostream>
using namespace std;

int main(void) {
	int sum;
	int day[] = {31,28,31,30,31,30,31,31,30,31,30,31};
	for(int i=1; i<=12; i++)
	{
		for(int j=1; j<=day[i-1]; j++)
		{
			if(i == j/10 + j%10)
			{
				sum += 1;
			}
			
			else
			{
				sum += 0;
			}
		}
	}
	cout<<sum<<endl;
	return 0;
}