function main()

     (a, b, c) = map(x -> parse(Int128, x), split(readline()))

    hante = sqrt(c) - ((sqrt(a) * sqrt(b))

    if hante > 0.00000
        ss = "Yes"
    elseif hante < 0.000000
        ss = "No"
    end

    return (print(ss))

end

main()