## CCC '10 J1 - What is n, Daddy?

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Points: 3
Time limit: 2.0s
Memory limit: 64M

Problem type
##### Canadian Computing Competition: 2010 Stage 1, Junior #1

Natalie is learning to count on her fingers. When her Daddy tells her a number (), she asks "What is , Daddy?", by which she means "How many fingers should I hold up on each hand so that the total is ?"

To make matters simple, her Daddy gives her the correct finger representation according to the following rules:

• the number may be represented on one or two hands;
• if the number is represented on two hands, the larger number is given first.

• is .
• is and .
• is and .

#### Input Specification

The input will be a single integer such that .

#### Output Specification

The output is the number of ways of producing that number on two hands, subject to the rules outlined above.

#### Sample Input

4

#### Output for Sample Input

3

• commented on March 9, 2021, 8:39 a.m.

Can't you just use a 10 branch if statement for all the number of fingers.

• commented on April 3, 2021, 4:17 a.m.

Yes, you may:)

• commented on Jan. 16, 2021, 5:06 p.m.

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• commented on Oct. 31, 2020, 7:03 a.m.

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• commented on Sept. 23, 2020, 12:00 p.m. edited

• commented on May 12, 2020, 11:20 p.m.

Would you show 5 on the right hand and then on the left? Does that count as 1 possibility?

• commented on May 13, 2020, 10:28 a.m.

Any duplicate cases would only be counted once.

• commented on April 26, 2020, 8:48 p.m.

how did I get stumped for 20 minutes on a 3 pointer

• commented on Feb. 19, 2019, 6:32 p.m.

Can anyone check my solution? Is there any other (maybe mathematical) way to solve this?

• commented on Feb. 19, 2019, 7:02 p.m.

If you're looking for more mathematical solution try thinking about the same problem but make the number of fingers also a parameter. Instead of it being 5 and make .

• commented on Jan. 30, 2019, 12:05 p.m. edited

Oh we only have 5 fingers lol.

• commented on Feb. 15, 2016, 11:55 a.m. edited

Could not figure out what I was doing wrong then I remembered we have only 5 fingers.

• commented on Aug. 29, 2020, 11:54 a.m.

well, that's what struck me30 min: Max fingers number - 5 important hint

• commented on Feb. 22, 2018, 11:29 a.m.

Oh darn I thought I had 40.

• commented on Nov. 2, 2017, 5:52 p.m.

wait hold on the example says 3, what does 3 mean

• commented on Aug. 11, 2020, 11:34 p.m. edit 3

3

• commented on July 3, 2018, 11:19 p.m. edited

3 is the number of ways to show 4.

4 is 4 is one way.

4 is 3 and 1 is another.

4 is 2 and 2 is the last one, because saying 4 is 1 and 3 would be the same as saying 4 is 3 and 1. Same goes with 4 is 0 and 4.

EDIT: