View Compilation Error

0_0_38907855_30014.cpp: In function 'void circle(int, int, int)':
0_0_38907855_30014.cpp:36:20: error: 'dn' was not declared in this scope
   36 |         cx = upx / dn, cy = upy / dn, r = get(cx, cy, x[a], y[a]);
      |                    ^~