@@ -0,0 +1,222 @@
+# Project Euler #20: Factorial digit sum%0A%0Adef fac(n):%0A    i = 1%0A    r = 1%0A    while i %3C= n:%0A        r *= i%0A        i += 1%0A    return r%0A    %0A%0An = fac(100)%0As = 0%0Awhile n:%0A    d = n %25 10%0A    n //= 10%0A    s += d%0A    %0Aprint(s)%0A

Add example.