#include <stdio.h>


int main(void){
	int m,d;
	int i,j;
	int A[12],ans;

	A[ 1-1] = 31;
	A[ 2-1] = 28;
	A[ 3-1] = 31;
	A[ 4-1] = 30;
	A[ 5-1] = 31;
	A[ 6-1] = 30;
	A[ 7-1] = 31;
	A[ 8-1] = 31;
	A[ 9-1] = 30;
	A[10-1] = 31;
	A[11-1] = 30;
	A[12-1] = 31;
	
	ans = 0;
	for(i=0;i<12;i++){
		for(j=0;j<A[i];j++){
			/*(i+1)月(j+1)日*/
			if(i+1 == (j+1)/10 + (j+1)%10){
				ans++;
			}

		}
	}

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

}