After winning his Fortnite game, Mr. DeMello decided to play ~N~ badminton games.

Each of these games has a score for Mr. DeMello, ~M_i~, and a score for his opponent, ~O_i~.

Mr. DeMello wins a game if he has strictly more points than his opponent.

Can you tell DeMello how many of the ~N~ games he won?

Constraints

~1 \le N \le 10^5~

~0 \le M_i, O_i \le 21~

Input Specification

The first line will contain an integer, ~N~, the number of games.

The next ~N~ lines will contain two integers, ~M_i~ and ~O_i~, the scores for the ~i^\text{th}~ game.

Output Specification

Output the number of games Mr. DeMello won.

Sample Input

6
0 0
1 0
21 21
20 21
5 3
16 3

Sample Output

3

Explanation for Sample Output

Mr. DeMello only wins ~3~ games: the second one (~1~ to ~0~), the fifth one (~5~ to ~3~), and the sixth one (~16~ to ~3~).