require 'prime'
x = gets.to_i
if Prime.prime?(x) || x == 1
    puts x
    exit(0)
end

res = 1
arr = Prime.each(Math.sqrt(x).to_i + 1).to_a
for a in arr do
    if x == 1
        puts res
        exit(0)
    end
    cnt = 0
    while x % a == 0 do
        x /= a
        cnt += 1
    end
    if cnt % 2 == 1
        res *= a
    end
end

puts res