+642573
=
669
+301
=
817
-52=
669+301
817-52
+642
418
+415418
=
704
+495
=
795
-73=
704+495
795-73
+415
375
+806375
=
889
+111
=
733
-37=
889+111
733-37
+806
f278
+218278
=
507
+177
=
906
-94=
507+177
906-94
+218
882
+766882
=
616
-222
=
382
+47=
616-222
382+47
+766
536
+320536
=
873
-183
=
218
+90=
873-183
218+90
+320
306
+478306
=
541
-418
=
307
-16=
541-418
307-16
+478
ffr