Solved by hoshino_ruby

#	Title	# Solved	Avg. Tries
1000	A+B STANDARD	325,290	2.59
1001	A-B STANDARD	279,649	1.45
1008	A/B STANDARD	231,035	2.90
2557	Hello World STANDARD	359,347	2.54
10869	사칙연산 STANDARD	230,809	2.24

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