from sys import stdin
input = stdin.readline

def main():
    h, w = map(int, input().split())
    a = [list(map(int, input().split())) for _ in range(h)]

    rows = dict()
    columns = dict()
    for i in range(h):
        for j in range(w):
            if a[i][j] in rows:
                rows[a[i][j]].add(i)
                columns[a[i][j]].add(j)
            else:
                rows[a[i][j]] = {i}
                columns[a[i][j]] = {j}
    
    ans = 0
    for key in rows.keys():
        if key:
            ans += min(len(rows[key]), len(columns[key]))
    print(ans)

main()