## 16 Nov Aurora Saturday 14:30 Python Practice 22.11.12.

**Question: **

Given an positive integer N, we define an equation like this:

N=a[1]+a[2]+a[3]+…+a[m];

a[i]>0,1<=m<=N;

My question is how many different equations you can find for a given N.

For example, assume N is 4, we can find:

4 = 4;

4 = 3 + 1;

4 = 2 + 2;

4 = 2 + 1 + 1;

4 = 1 + 1 + 1 + 1;

so the result is 5 when N is 4. Note that “4 = 3 + 1” and “4 = 1 + 3″ is the same in this problem. Now, you do it!”

**Input**

The input contains several test cases. Each test case contains a positive integer N(1<=N<=120) which is mentioned above. The input is terminated by the end of file.

**Output**

For each test case, you have to output a line contains an integer P which indicate the different equations you have found.

Sample Input

4

10

20Sample Output

5

42

627

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