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whatalnk/apc001-a.rb

Created February 4, 2018 12:36
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AtCoder APC #001 A
Raw
apc001-a.rb
x, y = gets.chomp.split(" ").map(&:to_i)
if x % y == 0 then
puts -1
exit
end
n = x * y + x
if n > 10**18 then
puts -1
else
puts n
end
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