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 $3$).