For each natural number k, let $C_k$ denotes the circle radius k centimeters in the counter-clockwise direction.After completing its motion on $C_k$, the particle moves to $C_{k+1}$ in the radial direction. The motion of the particle continues in this manner. The particle starts at (1,0).If the particle crosses the the positive direction of the x-axis for first time on the circle $C_n$,then n equal to

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