#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
	int month, cnt = 0;
	for (month = 1 ; month <= 12; month++){
		for(int a = 0; a <= 3 ; a++){
			for(int b = 0; b <= 9; b++){
				if(month == a + b){
					cnt++;
				}
			}
		}
	}
	cout << cnt << endl;
}