<s>
The	O
National	B-General_Concept
Center	I-General_Concept
for	I-General_Concept
Supercomputing	I-General_Concept
Applications	I-General_Concept
(	O
)	O
is	O
a	O
research	O
institution	O
located	O
in	O
Sofia	O
,	O
Bulgaria	O
.	O
</s>
<s>
When	O
established	O
,	O
the	O
center	O
operated	O
the	O
only	O
supercomputer	B-Architecture
in	O
the	O
Balkan	O
region	O
,	O
an	O
IBM	O
Blue	O
Gene/P	O
,	O
which	O
was	O
among	O
the	O
most	O
powerful	O
supercomputers	B-Architecture
in	O
the	O
world	O
according	O
to	O
TOP500	B-Operating_System
until	O
November	O
2009	O
.	O
</s>
<s>
The	O
supercomputer	B-Architecture
was	O
switched	O
off	O
in	O
2015	O
.	O
</s>
