#include
<stdarg.h>
f
(
m
)
{
int
i
,
s
=
0
;
for
(
i
=
0
;
i
<
m
;
i
+
+
)
s
+
=
i
;
return
s
;
}
main
(
)
{
exit
(
0
)
;
}
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