#include <stdio.h>
int main(){
int i[3];
    int a[12]={31,28,31,30,31,30,31,31,30,31,30,31};
i[2]=0;
for(i[0] = 1; i[0] < 12; i[0]++) {
for(i[1] = 1; i[1] < a[i[0]-1]; i[1]++) {
    if(i[1]/10+i[1]%10==i[0]){i[2]++;}
}}
	printf("%d\n",i[2]);
	return 0;
}