#include <stdio.h>

int main(void)
{
	int a[12]={31,28,31,30,31,30,31,31,30,31,30,31},i,j,s=0;
	for(i=0;i<12;i++)for(j=a[i];j>0;j--)if(i+1==j/10%10+j%10)s++;
	printf("%d",s);
	return 0;
}