h, w = map(int, input().split())
a = [list(map(int, input().split())) for i in range(h)]
m_row = dict()
m_column = dict()
for i in range(h):
    for j in range(w):
        if a[i][j] not in m_row:
            m_row[a[i][j]] = set()
        if a[i][j] not in m_column:
            m_column[a[i][j]] = set()
        m_row[a[i][j]].add(i)
        m_column[a[i][j]].add(j)
ans = 0
for i in m_row:
    if i == 0:
        continue
    ans += min(len(m_row[i]), len(m_column[i]))
print(ans)