This is pdfTeX, Version 3.14159265-2.6-1.40.17 (TeX Live 2016) (preloaded format=pdflatex 2017.5.16)  14 OCT 2018 13:56
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**docultex.tex
(./docultex.tex
LaTeX2e <2016/03/31>
Babel <3.9r> and hyphenation patterns for 83 language(s) loaded.

! LaTeX Error: File `siamltex.cls' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: cls)

Enter file name: 
! Emergency stop.
<read *> 
         
l.49 ^^M
        
*** (cannot \read from terminal in nonstop modes)

 
Here is how much of TeX's memory you used:
 10 strings out of 493014
 192 string characters out of 6133351
 53601 words of memory out of 5000000
 3651 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 10i,0n,7p,86b,8s stack positions out of 5000i,500n,10000p,200000b,80000s
!  ==> Fatal error occurred, no output PDF file produced!