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For each natural number \( k \). Let \( C_{k} \) denotes the circle with radius \( k \) centimetres and centre at origin. On the circle \( C_{k} \) a particle moves \( k \) centimetres in the
\( P \) counter-clockwise direction. After completing its

W motion on \( C_{k} \) the particle moves to \( C_{k+1} \) in the radial direction. The motion of the particle continue in this manner. The particle starts at \( (1,0) \). If the particle crosses the positive direction of the \( X \)-axis for the first time on the circle \( C_{n} \), then \( n=\ldots \)
\( (1997,2 \mathrm{M}) \)
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