#!/usr/bin/env python3
from itertools import count

lines = ([[int(z) for z in y.split(',')] for y in x.strip().split(" -> ")] for x in open("input.txt"))
blocked = set()
bottom = 0

for line in lines:
    for a, b in zip(line[:-1], line[1:]):
        for x in range(min(a[0], b[0]), max(a[0], b[0])+1):
            for y in range(min(a[1], b[1]), max(a[1], b[1])+1):
                blocked.add((x, y))
                bottom = max(bottom, y)


def drop():
    x, y = 500, 0
    if (x, y) in blocked:
        return False
    while y-1 != bottom:
        for nxt in ((x, y+1), (x-1, y+1), (x+1, y+1)):
            if nxt not in blocked:
                x, y = nxt
                break
        else:
            return x, y
    return x, y


for cnt in count():
    pos = drop()
    if not pos:
        print("Start is occupied!", cnt)
        break
    blocked.add(pos)