using System;
using System.Collections.Generic;
using System.Linq;

class D
{
	static int[] Read() => Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
	static (int, int) Read2() { var a = Read(); return (a[0], a[1]); }
	static void Main()
	{
		var (h, w) = Read2();
		var a = Array.ConvertAll(new bool[h], _ => Read());

		var d = new Dictionary<int, (HashSet<int> r, HashSet<int> c)>();

		for (int i = 0; i < h; i++)
		{
			for (int j = 0; j < w; j++)
			{
				var k = a[i][j];
				if (k == 0) continue;

				if (!d.ContainsKey(k)) d[k] = (new HashSet<int>(), new HashSet<int>());
				d[k].r.Add(i);
				d[k].c.Add(j);
			}
		}
		Console.WriteLine(d.Values.Sum(t => Math.Min(t.r.Count, t.c.Count)));
	}
}