
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
An electronic flea lands on a point $K_0$ on the number line. In the first step, it jumps 1 unit to the left to $K_1$. In the second step, it jumps 2 units to the right to $K_2$. In the third step, it jumps 3 units to the left to $K_3$. In the fourth step, it jumps 4 units to $K_4$, and so on, following this pattern. After making 100 steps, the electronic flea lands on the point on the number line represented by $K_{100}$, which is exactly 20. Find the number represented by the initial position $K_0$.

Present the answer in LaTex format: \boxed{Your answer}
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