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

int main() {
	
	int A[12]={31,28,31,30,31,30,31,31,30,31,30,31};
	int happy = 0;
	int jyu,ichi; 
	for(int i=0;i<12;i++){
		for(int j=1;j<=A[i];j++){
			jyu=j/10;
			ichi=j%10;
			if(i+1==ichi+jyu){
				happy++;
			}
		}
	}
	
	cout<<happy<<endl;
	return 0;
}