Function fun2(A as Integer, B as Integer, C as Integer, D as Integer) as Integer
if A > B then
    if A > C then
        if A > D then
            Return A
        else
            Return D
        end if
    else
        if C > D then
            Return C
        else
            Return D
        end if
    end if
else
    if B > C then
        if B > D then
            Return B
        else
            Return D
        end if
    else
        if C > D then
            Return C
        else
            Return D
        end if
    end if
end if
End Function