#include <stdio.h>

void main(void){
    const int dayList[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
    int count = 0;
    for(int i = 1 ; i <= 12 ; i++){
        for(int j = 1 ; j <= dayList[i-1] ; j++ ){
            if(i != j/10+j%10){
                continue;
            }
            count++;
        }
    }
    printf("%d",count);
}