C# program answer needed immediately pls help

Question

Question 

1. Write a program that randomly fills a 3 by 4 by 6 array, then prints the largest and smallest values in the array.

I have my code below please help me solve. The problem is when i run it shows me the 2nd smallest number. There is a bug in it. please help me solve it.

 

namespace _3_dimensional_array

{

class Program

{

static void Main(string[] args)

{

int[, ,] x = new int[3, 4, 6]; // declaration of multi-dimensional array

int i, c, b;

int k = 0, l = 0, m = 0, n = 0, o = 0, s = 0; // to use in input for loop

int t, y, u; // to find a maximum loop

Console.WriteLine("Enter 3 values :");

for (i = 0; i < 3; i++)

{

x[i, k, l] = Convert.ToInt32(Console.ReadLine());

}

Console.WriteLine("Enter 4 values :");

for (c = 0; c < 4; c++)

{

x[m, c, n] = Convert.ToInt32(Console.ReadLine());

}

Console.WriteLine("Enter 6 values :");

for (b = 0; b < 6; b++)

{

x[s, o, b] = Convert.ToInt32(Console.ReadLine());

}

// loops for input

t = x[0, k, l];

y = x[m, 0, n];

u = x[s, o, 0];

for (int q = 1; q < 3; q++)

{

if (t < x[q, k, l])

{

t = x[q, k, l];

}

}

for (int p = 1; p < 4; p++)

{

if (y < x[m, p, n])

{

y = x[m, p, n];

}

}

for (int h = 1; h < 6; h++)

{

if (u < x[s, o, h])

{

u = x[s, o, h];

}

}

// loops for maximum value

int yu; // to assing maximum value

if ((t > y) && (t > u))

{

yu = t;

}

else if ((y > t) && (y > u))

{

yu = y;

}

else

{

yu = u;

}

// to find maximum value

Console.WriteLine("The maximum value is {0}.", yu);

int sd, af, qw; // use to find minimum value

sd = x[0, k, l];

af = x[m, 0, n];

qw = x[s, o, 0];

for (int a = 0; a < 3; a++)

{

if (sd > x[a, k, l])

{

sd = x[a, k, l];

}

}

for (int f = 0; f < 4; f++)

{

if (af > x[m, f, n])

{

af = x[m, f, n];

}

}

for (int j = 0; j < 6; j++)

{

if (qw > x[s, o, j])

{

qw = x[s, o, j];

}

}

// for loop for minimum value

int mu; // it is assigned to minimum value

if ((sd<qw) && (sd<af))

{

mu = sd;

}

else if (sd > af && qw > af)

{

mu = af;

}

else

{

mu = qw;

}

// used to find minimum value

Console.WriteLine("The minimum value {0}.", mu);

// holding output screen

Console.ReadLine();

}

}

}