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

scores = []
for ii in range(len(data)):
    for jj in range(len(data[ii])):
        top = data[ii][jj]
        a = 0
        i = ii
        for j in range(jj+1, len(data[ii])):
            a += 1
            if data[i][j] >= top:
                break

        b = 0
        for j in reversed(range(0, jj)):
            b += 1
            if data[i][j] >= top:
                break

        j = jj
        c = 0
        for i in range(ii+1, len(data)):
            c += 1
            if data[i][j] >= top:
                break

        d = 0
        for i in reversed(range(0, ii)):
            d += 1
            if data[i][j] >= top:
                break

        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))