lines = [ [int(j) for j in list(i)] for i in open("input.txt", 'r').read().splitlines()]

flashes = 0
i = 0
found = False
while i < 99 or not found:
    lines = [ [x+1 for x in y] for y in lines]
    flashed = True
    while flashed:
        flashed = False
        for x in range(10):
            for y in range(10):
                if lines[x][y] > 9:
                    if(i<100):
                        flashes += 1
                    lines[x][y] = 0
                    flashed = True
                    if x != 0 and lines[x-1][y] != 0:
                        lines[x-1][y] += 1 
                    if x != 0 and y != 9 and lines[x-1][y+1] != 0:
                        lines[x-1][y+1] += 1 
                    if y != 9 and lines[x][y+1] != 0:
                        lines[x][y+1] += 1 
                    if x != 9 and y != 9 and lines[x+1][y+1] != 0: 
                        lines[x+1][y+1] += 1 
                    if x != 9 and lines[x+1][y] != 0:
                        lines[x+1][y] += 1 
                    if x != 9 and y != 0 and lines[x+1][y-1] != 0:
                        lines[x+1][y-1] += 1 
                    if y != 0 and lines[x][y-1] != 0:
                        lines[x][y-1] += 1 
                    if x != 0 and y != 0 and lines[x-1][y-1] != 0:
                        lines[x-1][y-1] += 1 
    i += 1
    if lines.count([0, 0, 0, 0, 0, 0, 0, 0, 0, 0]) == 10:
        print(i)
        found = True

print(flashes)