require "big"
lib C
    fun getchar_unlocked : Int32
end
def read_word : String
    ans = [] of Char
    f = 1
    c = C.getchar_unlocked()
    while [9, 10, 11, 12, 13, 32].includes?(c)
        c = C.getchar_unlocked()
    end
    while ![-1, 9, 10, 11, 12, 13, 32].includes?(c)
        ans.push('\0' + c)
        c = C.getchar_unlocked()
    end
    return ans.join("")
end
puts(read_word.to_big_i * 10.to_big_i)