#include<iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;

    double topNumber;
    double bottomNumber;

    double total=0;
    double max = INT_MIN;
    double min = INT_MAX;
    int sum = 0;
    int maxDiff = 0;

    for (int i = 1; i <= n; i++)
    {
        cin >> topNumber;
        cin >> bottomNumber;

        total = topNumber + bottomNumber;
        sum = sum + total;
        if (total > max)
        {
            max = total;
        }

        if (total < min)
        {
            min = total;
        }

    }
    maxDiff = max - min;
    if (sum % n == 0&&sum!=0)
    {
        cout << "Yes, value=" << sum / n << endl;
    }
    else
    {
        cout << "No, maxdiff=" << maxDiff << endl;
    }



}