final = Array.new
base = 1
i = 0

while i < 1000
        i = base * 3
        final.push(i)
        base += 1

end

i = 0
base = 1

while i < 1000
        i = base * 5
        final.push(i)
        base += 1

end

final.uniq!

total = 0

for num in final 
total += num
end

puts total