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using System;
struct S
{
public static bool operator == (S s, S i)
{
throw new ApplicationException ();
}
public static bool operator != (S s, S i)
{
throw new ApplicationException ();
}
}
struct S2
{
public static int counter;
public static bool operator == (S2 s, S2 i)
{
counter++;
return true;
}
public static bool operator != (S2 s, S2 i)
{
throw new ApplicationException ();
}
}
struct S3
{
public static int counter;
public static implicit operator int?(S3 arg)
{
counter++;
return null;
}
}
class C
{
public static int Main ()
{
S? s = new S ();
S? s2 = null;
S? s4 = null;
if ((s == s2) != false)
return 1;
if ((s2 == s) != false)
return 2;
if ((s2 == s4) != true)
return 3;
S x = new S ();
if ((s2 == x) != false)
return 5;
if ((x == s2) != false)
return 6;
S2? s2_1 = new S2 ();
S2? s2_3 = new S2 ();
S2 x2 = new S2 ();
if ((s2_1 == s2_3) != true)
return 7;
if ((s2_1 == x2) != true)
return 8;
if ((x2 == s2_1) != true)
return 9;
if (S2.counter != 3)
return 10;
S3 s3;
if ((s3 == null) != true)
return 20;
if ((null == s3) != true)
return 21;
if (S3.counter != 2)
return 22;
return 0;
}
}
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