class Happyday{
  public static void main(String args[]){
    int a[] = new int[12];
    a[0] = 31;
    a[1] = 28;
    a[2] = 31;
    a[3] = 30;
    a[4] = 31;
    a[5] = 30;
    a[6] = 31;
    a[7] = 31;
    a[8] = 30;
    a[9] = 31;
    a[10] = 30;
    a[11] = 31;
    int sum = 0;
    for(int i = 0; i < 12; i++){
      for(int j = 1; j <=a[i]; j++){
        int b = 0 , c = 0;
        if(j >= 30){
          b = 3;
          c = j - 30;
        }else if(j >= 20){
          b = 2;
          c = j - 20;
        }else if(j >= 10){
          b = 1;
          c = j - 10;
        }else{
          b = 0;
          c = 0;
        }
        if(i + 1 == b + c){
          sum += 1;
        }
      }
    }
    System.out.println(sum);
  }
}