#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pb push_back
#define IOS ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define gcd(a,b) __gcd((a),(b))
#define lcm(a,b) ((a)*(b))/__gcd((a),(b))
#define vi vector<int>
#define vll vector<long long>
#define vvi vector<vi>
#define mt make_tuple
#define mp make_pair
#define hell 1000000007
#define mod 998244353
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vpii vector<pii>
#define vpll vector<pll>
#define all(a) a.begin(),a.end()
#define ign cin.ignore();
#define g(a,b) get<a>(b)
#define vt(a) vector<a>
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define repi(i,a,b) for(ll i=b-1;i>=a;i--)
#define fi first
#define se second

#define o_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define o_setll tree<ll, null_type,less<ll>, rb_tree_tag,tree_order_statistics_node_update>
//to delete an element
//s.erase(s.find_by_order(s.order_of_key(ele)));
//where s is the name of the ordered_set
//member functions :
//1. order_of_key(k) : number of elements strictly lesser than k
//2. find_by_order(k) : k-th element in the set

using namespace std;
using namespace __gnu_pbds;

void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef MY_PROJECT
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

int main()
{
    IOS
    /*
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    */
    ll ntc=1;
    //cin>>ntc;
    rep(tc,1,ntc+1)
    {
    	//cout<<"Case #"<<tc<<": ";
    	int n;
    	cin>>n;
    	vi startt(n);
    	vi endd(n);
    	for(int i=0;i<n;i++)
    	{
    	    cin>>startt[i]>>endd[i];
    	}
    	sort(all(startt));
    	sort(all(endd));
    	if(n%2==1){
            int num=n/2;
            int beg=startt[num];
            int en=endd[num];
            cout<<en-beg+1<<"\n";
    	}
    	else{
            int num1=n/2-1;
            int num2=n/2;
            int beg1=startt[num1];
            int en1=endd[num1];
            int beg2=startt[num2];
            int en2=endd[num2];
            int low=beg1+beg2;
            int high=en1+en2;
            cout<<high-low+1<<"\n";
    	}
    }
    return 0;
}


Measured memory_bytes: 4784