#include <stdio.h>

int main(){

	int arry[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
	int sum = 0;
	int i,j;
	int a,b;

	for(i = 1; i < 13; i++){
		for(j = 1; j < arry[i-1]; j++){
			a = j / 10;
			b = j - a * 10;
			if(i == a + b){
				sum++;
			}
		}
	}

	printf("%d\n", sum);

	return 0;

}