static void Main()
{
var n = int.Parse(Console.ReadLine());
var rs = new int[n].Select(_ => Console.ReadLine().Split().Select(int.Parse).ToArray()).ToArray();
var xs = rs.Select(r => r[0]).Concat(rs.Select(r => r[2])).Distinct().OrderBy(v => v).ToArray();
var xd = Enumerable.Range(0, xs.Length).ToDictionary(i => xs[i]);
var ys = rs.Select(r => r[1]).Concat(rs.Select(r => r[3])).Distinct().OrderBy(v => v).ToArray();
var yd = Enumerable.Range(0, ys.Length).ToDictionary(i => ys[i]);
var raq = new StaticRAQ2(xs.Length, ys.Length);
foreach (var r in rs)
{
raq.Add(xd[r[0]], yd[r[1]], xd[r[2]], yd[r[3]], 1);
}
var s = raq.GetAll();
var sum = 0L;
for (int i = 0; i < xs.Length; i++)
{
for (int j = 0; j < ys.Length; j++)
{
if (s[i, j] > 0)
{
sum += (long)(xs[i + 1] - xs[i]) * (ys[j + 1] - ys[j]);
}
}
}
Console.WriteLine(sum);
}
static void Main()
{
var n = int.Parse(Console.ReadLine());
var rs = new int[n].Select(_ => Console.ReadLine().Split().Select(int.Parse).ToArray()).ToArray();
var raq = new StaticRAQ2(1000, 1000);
foreach (var r in rs)
{
raq.Add(r[0], r[1], r[2], r[3], 1);
}
var s = raq.GetAll();
var M = 0L;
for (int i = 0; i < 1000; i++)
{
for (int j = 0; j < 1000; j++)
{
M = Math.Max(M, s[i, j]);
}
}
Console.WriteLine(M);
}
static void Main()
{
var z = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
int h = z[0], w = z[1];
var s = new int[h].Select(_ => Console.ReadLine()).ToArray();
var k = s.Sum(t => t.Count(c => c == '.'));
var p2 = new long[k + 1];
p2[0] = 1;
for (int i = 0; i < k; ++i)
{
p2[i + 1] = p2[i] * 2 % M;
}
var raq = new StaticRAQ2(h, w);
raq.Add(0, 0, h, w, -1);
for (int i = 0; i < h; i++)
{
var start = -1;
for (int j = 0; j <= w; j++)
{
if (j < w && s[i][j] == '.')
{
if (start == -1)
{
start = j;
}
}
else
{
if (start != -1)
{
raq.Add(i, start, i + 1, j, j - start);
}
start = -1;
}
}
}
for (int j = 0; j < w; j++)
{
var start = -1;
for (int i = 0; i <= h; i++)
{
if (i < h && s[i][j] == '.')
{
if (start == -1)
{
start = i;
}
}
else
{
if (start != -1)
{
raq.Add(start, j, i, j + 1, i - start);
}
start = -1;
}
}
}
var sum = raq.GetAll();
var r = 0L;
for (int i = 0; i < h; i++)
{
for (int j = 0; j < w; j++)
{
if (sum[i, j] == -1)
{
continue;
}
r = (r + (p2[sum[i, j]] - 1 + M) % M * p2[k - sum[i, j]]) % M;
}
}
Console.WriteLine(r);
}
