u = [6.1, 6.9, 5.7, 4.8, 5.3]
i = 0
a = u[0]
temp = (5.0 - u[1]).abs

for i in 0..4
    m = (5.0 - u[i]).abs
    if(m < temp)
        a = u[i]
        temp = m
    end
end

puts a