#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using V = vector<ll>;
using VV = vector<V>;
using VVV = vector<VV>;
using VS = vector<string>;
using P = pair<ll,ll>;
using M = map<ll,ll>;
using Q = queue<ll>;
using PQ = priority_queue<ll>;
using PQG = priority_queue<ll,V,greater<ll>>;
using S = set<ll>;
const ll MOD = 1000000007;
const ll Mod = 998244353;
const ll INF = 1LL << 60;
#define rep(i,n) for(ll i = 0; i < n; i++)
#define rep2(i,s,n) for(ll i = s; i < n; i++)
#define rep3(i,s,n) for(ll i = s; i <= n; i++)
#define all(x) (x).begin(),(x).end()
#define MP(a,b) make_pair(a,b)
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
template<class T>void Vin(vector<T>&a){rep(i,(int)a.size())cin>>a[i];}
template<class T>void Vout(const vector<T>&a){rep(i,(int)a.size())cout<<a[i]<<endl;}
ll power(ll a,ll b,const ll&M){a%=M;ll res=1;while(b>0){if(b&1)res=res*a%M;a=a*a%M;b>>=1;}return res;}
const ll H[4] = {0,1,0,-1}, W[4] = {1,0,-1,0};

int main() {
    ll n, m, q;
    cin >> n >> m >> q;
    VV ab(n);
    S st;
    rep(i,q) {
        ll a, b;
        cin >> a >> b;
        ab[a-1].pb(b-1);
        st.insert(a-1);
    }
    V ans(m);
    for(ll x : st) {
        cout << x << endl;
        sort(all(ab[x]));
        reverse(all(ab[x]));
        for(ll y : ab[x]) {
            ll z;
            if(y == 0) z = 1;
            else z = ans[y-1]+1;
            while(y < m && ans[y] < z) ans[y++] = z;
        }
    }
    cout << ans[m-1] << endl;
}