Types: n: int, vw: int, vc: int, xi: int, yi: int

Ranges: 0 ≤ n ≤ 1,000, 1 ≤ vw ≤ 10, 1 ≤ vc ≤ 10, -10,000 ≤ xi ≤ 10,000, -10,000 ≤ yi ≤ 10,000, xi < xj for all i < j

Addtl Info: Input is terminated with n = 0, which should not be processed.