This robot uses the mechanism: If input is <1000 or >1 it will print "input error" Then it will add all number from one to this number if the number fits in the regulations. Like this: If input is 10 Add numbers 1x2x3x4x5.... until 10. The output will be 3,628,800 Also, click the "a" , "s" , "w" , and "d" to switch between the voice of the robot. Exclusive: Press space to hear a kitten speak. You have to press one of these keys before you hit the green flag if you want to hear a special voice.