#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define chmin(x,y) x = min((x),(y));
#define chmax(x,y) x = max((x),(y));
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
const int INF = 1e9;
const long long LINF = 1e17;
const int MOD = 1000000007;
//const int MOD = 998244353;
const double PI = 3.14159265358979323846;

int main(){
    int n,m;
    cin >> n >> m;
    vector<int> b(n),c(n);
    rep(i,n) cin >> b[i] >> c[i];
    rep(i,n) --b[i], --c[i];
    vector<int> cnt(n,0);
    vector<map<int,int>> in(m);
    rep(i,n){
        cnt[c[i]] ++;
        in[b[i]][c[i]] ++;
    }
    vector<int> mx(n,0);
    rep(i,m){
        for(auto p:in[i]){
            chmax(mx[p.first],p.second);
        }
    }
    int ans = 0;
    for(int color = 0; color < n;color ++){
        if(cnt[color] == 0) continue;
        int s = cnt[color];
        ans += s - mx[color];
    }
    cout << ans << endl;
    return 0;
}