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#include <bits/stdc++.h>

#define ll long long
#define str string
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second

#define vc vector<char>
#define vvc vector<vc>
#define vi vector<int>
#define vll vector<ll>
#define vvi vector<vi>
#define vvll vector<vll>
#define vvvll vector<vvll>
#define vs vector<str>
#define vvs vector<vs>
#define vpii vector<pii>
#define vvpii vector<vpii>
#define vpll vector<pll>
#define vvpll vector<vpll>
#define vb vector<bool>
#define vvb vector<vb>
#define rep(i, a, b) for (int i = (a); i < int(b); i++)
#define repi(i, a, b) for (int i = (a); i <= int(b); i++)


using namespace std;
ll INF = LONG_LONG_MAX/2;
ll mod = 1000000000 + 7;

template <typename T, typename L>
void read(vector<T> & _data, L & _size, bool _shift) {
    _data.resize(_size + (ll)_shift);
    for (ll i = (ll)_shift; i < _size + (ll)_shift; i++)
        cin >> _data[i];
}

template <typename T, typename L>
void read(vector<vector<T>> & _data, L & _rows, L & _cols, bool _shiftRows, bool _shiftCols) {
    _data.resize(_rows + (ll)_shiftRows);
    for (ll i = 0; i < _rows + (ll)_shiftRows; i++)
        _data[i].resize(_cols + (ll)_shiftCols);
    for (ll i = (ll)_shiftRows; i < _rows + (ll)_shiftRows; i++)
        for (ll j = (ll)_shiftCols; j < _cols + (ll)_shiftCols; j++)
            cin >> _data[i][j];
}

template <typename T>
void write(vector<T> & _data, bool _shift) {
    for (ll i = (ll)_shift; i < _data.size(); i++)
        cout << _data[i] << " ";
    cout << endl;
}


//TODO: SOLUTION

int n, m, q;
vvb hasLoop;


bool match(int x, vi & matchB, vi & matchG, vvi & neiB, vvi & neiG, vb & been)
{
    if (been[x])
        return false;

    been[x] = true;
    for (int i = 0; i < neiB[x].size(); i++) {
        int y = neiB[x][i];
        if (matchG[y] == -1) {
            matchB[x] = y;
            matchG[y] = x;
            return true;
        }
        else {
            int b = matchG[y];
            if (match(b, matchB, matchG, neiB, neiG, been)) {
                matchB[x] = y;
                matchG[y] = x;
                return true;
            }
        }
    }
    return false;
}


int maxThrows() {
    vvi idx(n, vi(n, -1));
    int id1 = 0, id2 = 0;

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (hasLoop[i][j])
                idx[i][j] = id1++;
            else
                idx[i][j] = id2++;
        }
    }

    if (id1 == 0 || id2 == 0)
        return 0;

    vvi neiB(id1);
    vvi neiG(id2);

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            for (int k = 0; k < n; k++) {
                if (k == i)
                    continue;
                if (hasLoop[i][j] && !hasLoop[k][j]) {
                    neiB[idx[i][j]].push_back(idx[k][j]);
                    neiG[idx[k][j]].push_back(idx[i][j]);
                }
                if (!hasLoop[i][j] && hasLoop[k][j]) {
                    neiG[idx[i][j]].push_back(idx[k][j]);
                    neiB[idx[k][j]].push_back(idx[i][j]);
                }
            }
            for (int k = 0; k < n; k++) {
                if (k == j)
                    continue;
                if (hasLoop[i][j] && !hasLoop[i][k]) {
                    neiB[idx[i][j]].push_back(idx[i][k]);
                    neiG[idx[i][k]].push_back(idx[i][j]);
                }
                if (!hasLoop[i][j] && hasLoop[i][k]) {
                    neiG[idx[i][j]].push_back(idx[i][k]);
                    neiB[idx[i][k]].push_back(idx[i][j]);
                }
            }
        }
    }

    vi matchB(id1, -1);
    vi matchG(id2, -1);

    bool found = true;
    vb been = vb(id1, false);

    while (found) {
        fill(been.begin(), been.end(), false);
        found = false;
        for (int x = 0; x < id1; x++) {
            if (matchB[x] == -1) {

                if (match(x, matchB, matchG, neiB, neiG, been)) {
                    found = true;
                }
            }
        }
    }

    int ans = 0;
    for (int i = 0; i < id1; i++) {
        if (matchB[i] != -1)
            ans++;
    }

    return ans;
}

void solve() {
    cin >> n >> m >> q;
    hasLoop = vvb(n, vb(n, false));

    int x1, y1, x2, y2;
    for (int i = 0; i < m; i++) {
        cin >> x1 >> y1 >> x2 >> y2;
        for (int j = x1; j <= x2; j++) {
            for (int k = y1; k <= y2; k++) {
                hasLoop[j-1][k-1] = !hasLoop[j-1][k-1];
            }
        }
    }

    cout << maxThrows() << endl;
    while (q--) {
        int x, y; cin >> x >> y;
        hasLoop[x-1][y-1] = !hasLoop[x-1][y-1];
        cout << maxThrows() << endl;
    }
}


int main() {
    ios::sync_with_stdio(false);
    // TODO: Set value of this variable manually
    bool _multipleTestCases = false;

    if (_multipleTestCases) {
        ll t; cin >> t;
        while (t--)
            solve();
    }
    else {
        solve();
    }

    return 0;
}