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
#include <bits/stdc++.h>
using namespace std;

int main() {
  int n,l,r,x=0;
  cin>>n;
  for(int i=0;i<n;i++){
    cin>>l>>r;
    x += r-l+1;
  }
  cout << x << endl;
}