import sys
from collections import defaultdict

sys.setrecursionlimit(10 ** 7)
input = sys.stdin.readline
f_inf = float('inf')
mod = 10 ** 9 + 7


def resolve():
    n, m = map(int, input().split())
    cnt_col = [0] * n
    box = [defaultdict(int) for _ in range(m)]
    for _ in range(n):
        b, c = map(lambda x: int(x) - 1, input().split())
        cnt_col[c] += 1
        box[b][c] += 1

    cnt_max = [0] * n
    for i in range(m):
        for k, v in box[i].items():
            cnt_max[k] = max(cnt_max[k], v)

    res = sum(cnt_col[i] - cnt_max[i] for i in range(n))
    print(res)


if __name__ == '__main__':
    resolve()