// In the name of God
# include <iostream>
using namespace std;
int func(int length,int s){
	if(length==1 && s<=9)
		return 1;
	int sum=0;
	for(int i=0;i<10;i++)
		if(s-i>=0)
			sum+=func(length-1,s-i);
	return sum;
}
int main()
{
	int s;
	cin >> s;
	if(s==1)
		cout << func(9,s)+1;
	else
		cout << func(9,s);
	return 0;
}