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

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    ll n;
    cin >> n;
    for(ll i=0;i<n;i++)
    {
        ll x,y;
        cin >> x >> y;
    }
    cout << 0;
    return 0;
}