import math
H,W = map(int,input().split())
src = [[]]
src += ['0' + input() + '0' for i in range(H)]

ans = float('inf')
for px in (0,W+1):
    for py in range(1,H+1):
        tmp = 0
        for y in range(1,H+1):
            for x in range(1,W+1):
                if src[y][x] == '0': continue
                tmp += math.hypot(px-x, py-y)
        ans = min(ans, tmp)
for py in (0,H+1):
    for px in range(1,W+1):
        tmp = 0
        for y in range(1,H+1):
            for x in range(1,W+1):
                if src[y][x] == '0': continue
                tmp += math.hypot(px-x, py-y)
        ans = min(ans, tmp)
print(ans)