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

int main(){

int n;
cin>>n;
int64_t a[n],b[n];

for(int i=0;i<n;i++)
{
cin>>a[i]>>b[i];
}

sort(a,a+n);
sort(b,b+n);

double a1 = (a[n/2]+a[(n-1)/2])/(2*1.0);
double b1 = (b[n/2]+b[(n-1)/2])/(2*1.0);
if(n%2==0)
{
    cout<< (int)((b1-a1)*2 +1);

}
else{cout<< (int)(b1-a1+1);}



return 0; }
