#!/usr/bin/env python3
import sys
from collections import defaultdict
data = [l.strip() for l in sys.stdin.readlines()]
grid = defaultdict(bool)
for i, row in enumerate(data):
    for j, col in enumerate(row):
        grid[complex(j, i)] = (col == "#")
pos, d = complex(len(data) // 2, len(data[0]) // 2), 1j
becomeinfected = 0
for _ in range(10000):
    if grid[pos]:
        d *= 1j
    else:
        d *= -1j
        becomeinfected += 1
    grid[pos] = not grid[pos]
    pos += d
print(becomeinfected)