using namespace std;
#include <bits/stdc++.h>
#define BEGIN ios_base::sync_with_stdio(0);cin.tie(0);
#define END return EXIT_SUCCESS;
#define FOR(I,A,B) for(int (I)=(A);(I)<(B);++(I))
#define ALL(C) (C).begin(),(C).end()
inline void solve()
{
	int DAY[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
	int ans=0;
	FOR(month,1,13) 
	{
		FOR(day,1,DAY[month]+1)
		{
			int x=day,y=0;
			while(x) 
			{
				y+=x%10;
				x/=10;
			}
			if(month==y) ans++;
		}
	}
	cout<<ans<<endl; 
}
int main(int argc,char**argv)
{
	BEGIN
	solve();
	END
}