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

Explanation

The motion of the particle on the circles is shown with bold lines in the figure starting at `A_(0)(1,0)`. Note that on every circle the particle tracels just 1 rad. The particle crosses the positive direction of the x-axis first time on `C_(n)`, where n is the least positive integer such that `nge2pirArrn=7`.