#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001


int main(){	
	int ans = 0;
	vector<int> t = {31,28,31,30,31,30,31,31,30,31,30,31};
	for(int i=1;i<=12;i++){
		for(int j=1;j<=t[i-1];j++){
			int s = 0;
			int temp = j;
			while(temp!=0){
				s += temp%10;
				temp /= 10;
			}
			if(s==i)ans++;
		}
	}
	
	cout<<ans<<endl;
	
	return 0;
	
}