def factorial(n)
    total = n
    for i in 1...n do
        total *= i
    end
    
    yield total
end

n = gets.to_i
factorial(n) do |num| 
    puts num
end

def factorial(n)
    yield(n)
end
n = gets.to_i
puts factorial(n) { (1..n).reduce(1, :*) }

def factorial(n, i)
    yield(n, i)
end

n = gets.to_i
i = n - 1
puts factorial(n, i) { 
    while i != 0
        n = n * i
        i -= 1
    end
    n
}

def factorial
    yield
end

n = gets.to_i
factorial do 
    puts (1..n).reduce(:*)
end