data = []
for line in open("input"):
    data.append(list(map(int, line.strip())))

def count(top, ii, jj):
    n = 0
    for i in ii:
        for j in jj:
            n += 1
            if data[i][j] >= top:
                return n
    return n

scores = []
for ii in range(len(data)):
    for jj in range(len(data[ii])):
        top = data[ii][jj]
        a = count(top, [ii], range(jj+1, len(data[ii])))
        b = count(top, [ii], reversed(range(0, jj)))
        c = count(top, range(ii+1, len(data)), [jj])
        d = count(top, reversed(range(0, ii)), [jj])

        #print(ii,jj,a,b,c,d)
        score = a*b*c*d
        scores.append(score)

#print(visible)
#print(sum(sum(x) for x in visible))
print(max(scores))