#include <stdio.h>

int main(){
  int day[] = {0, 31, 28, 31, 30, 31, 30, 31 , 31, 30, 31, 30, 31};
  int count = 0;

  int i,j;
  for(i = 1; i < 13; i++){
    for(j = 1; j <= day[i]; j++ ){
      if(i == (j%10 + (j/10)&10) )
        count++;
    }
  }
  printf("%d\n",count);
  return 0;
}