**Solution for Net-Force.nl : Level 601 – Keep walking…**
**Quest:**

This is a challenge to test your basic programming skills.

Pseudo code:

Set X = 1

Set Y = 1

Set previous answer = 1

answer = X * Y + previous answer + 3

After that => X + 1 and Y + 1 (‘answer’ becomes ‘previous answer’) and repeat this till you have X = 525.

The final answer is the value of ‘answer’ when X = 525. Fill it in below to check if it’s the correct answer. If it is, you will get the password for the challenge page.

Example:

`5 = 1 * 1 + 1 + 3`

12 = 2 * 2 + 5 + 3

24 = 3 * 3 + 12 + 3

........................

........................

**Since this is a programming challenge, let’s look at the clues given to us.**

Set X = 1

Set Y = 1

Set previous answer = 1

answer = X * Y + previous answer + 3

So we need 3 variables, **x**, **y** and **answer **as we can reuse “**answer**” as “**previous answer**“. This will translate to something like the following.

x=1

y=1

answer = 1

answer = x * y + answer + 3

Based on the hints given, i’ve finally code an python script that gave me the answer.

import os, sys

def main():

x=1

y=1

answer = 1

for z in range(0,525):

answer = x * y + answer + 3

x+=1

y+=1

if x==524:

print(“\nprevious answer = %d”) % (answer)

print(“\nx=%d, y=%d\nanswer = %d”) % (x,y,answer)

if __name__ == ‘__main__’:

main()

Running my own script, i got back this:

previous answer = 47823644

x=526, y=526

answer = 48373851

Entering the answer in the challenge page and we smelled success again.

So the answer for this challenge is “**pr0ggen**”

Cheers

0x4A61636F62