using System;
using System.Collections.Generic;
using System.Linq;
 
class Program
{
    static void Main()
    {
        List<int> data = new List<int> { 123456, 125678, 127899, 130000, 132345 };
 
        int n = data.Count;
        double sumX = 0, sumY = 0, sumXY = 0, sumXX = 0;
 
        for (int i = 0; i < n; i++)
        {
            double x = i + 1;
            double y = data[i];
            sumX += x;
            sumY += y;
            sumXY += x * y;
            sumXX += x * x;
        }
 
        double slope = (n * sumXY - sumX * sumY) / (n * sumXX - sumX * sumX);
        double intercept = (sumY - slope * sumX) / n;
 
        double nextX = n + 1;
        double predicted = slope * nextX + intercept;
 
        Console.WriteLine($"ค่าคาดการณ์ถัดไป: {predicted:000000}");
    }
}
 

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