def scan; gets.split.map(&:to_i); end

n = scan[0]

r = 1
2.upto(n){|i|
    r=(i*r)
    if r.modulo(1000000000000)==0
        puts "0"*12
        exit
    end
}

if r >= 1000000000000
    p r.modulo(1000000000000)
else
    puts sprintf("%012d",r.modulo(1000000000000))
end