p03606 AtCoder Beginner Contest 073 - Theater
Joisino is working as a receptionist at a theater.

The theater has 100000 seats, numbered from 1 to 100000.

According to her memo, N groups of audiences have come so far, and the i-th group occupies the consecutive seats from Seat l_i to Seat r_i (inclusive).

How many people are sitting at the theater now?

Constraints

* 1≤N≤1000
* 1≤l_i≤r_i≤100000
* No seat is occupied by more than one person.
* All input values are integers.

Input

Input is given from Standard Input in the following format:


N
l_1 r_1
:
l_N r_N


Output

Print the number of people sitting at the theater.

Examples

Input

1
24 30


Output

7


Input

2
6 8
3 3


Output

4
```python
print(sum(1-eval(s.replace(' ','-'))for s in open(0).readlines()[1:]))
```