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#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <stack>
#include <cstdio>
#include <set>
#include <map>
#include <string>
#include <queue>
#include <stack>
#include <unordered_map>
#include <bitset>
using namespace std;

typedef long long int LL;
typedef long double LD;
typedef vector<int> VI;
typedef vector<LL> VLL;
typedef vector<LD> VLD;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef vector<PII> VPII;

const int INF = 1000000001;
const LD EPS = 10e-9;

#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define VAR(v, n) __typeof(n) v = (n)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define MP make_pair
#define PB push_back
#define ST first
#define ND second
#define abs(a) ((a)<0 ? -(a) : (a))
#define max(a, b) ((a) > (b) ? (a) : (b))
#define min(a, b) ((a) < (b) ? (a) : (b))

const int MAX_N = 10005;

int n, m, q;
int xx1, yy1, x2, y2, a, b;
bool grid[MAX_N][MAX_N];
int colSums[MAX_N], rowSums[MAX_N];
LL hulaCount, notHulaCount;

void calcSums()
{
    for(int i = 1; i <= n; ++i)
    {
        for(int j = 1; j <= n; ++j)
        {
            hulaCount += grid[i][j];
            colSums[j] += grid[i][j];
            rowSums[i] += grid[i][j];
        }
    }

    notHulaCount = n*n - hulaCount;
}

LL solve()
{
    LL res = 0;
    LL blockedHula = 0, blockedNotHula = 0;

    for(int i = 1; i <= n; ++i)
    {
        for(int j = 1; j <= n; ++j)
        {
            if(rowSums[i] != colSums[j])
            {
                continue;
            }

            if(rowSums[i] == n && grid[i][j])
            {
                ++blockedHula;
            }
            else if(rowSums[i] == 0 && !grid[i][j])
            {
                ++blockedNotHula;
            }
        }
    }

    if(hulaCount == notHulaCount)
    {
        return hulaCount - max(blockedHula, blockedNotHula);
    }
    else if(hulaCount > notHulaCount)
    {
        return notHulaCount - blockedNotHula;
    }
    else
    {
        return hulaCount - blockedHula;
    }
}

void update()
{
    grid[a][b] = !grid[a][b];

    rowSums[a] = rowSums[a] + (grid[a][b] ? 1 : -1);
    colSums[b] = colSums[b] + (grid[a][b] ? 1 : -1);

    if(grid[a][b])
    {
        ++hulaCount;
        --notHulaCount;
    }
    else
    {
        --hulaCount;
        ++notHulaCount;
    }
}

void printDebug()
{
    cout << endl << "grid: " << endl;
    for(int i = 1; i <= n; ++i)
    {
        for(int j = 1; j <= n; ++j)
        {
            cout << grid[i][j] << ' ';
        }
        cout << endl;
    }
    cout << "-----" << endl << endl;

    cout << "sums: " << endl;
    for(int i = 1; i <= n; ++i)
    {
        cout << "i: " << i << ", row: " << rowSums[i] << ", col: " << colSums[i] << endl;
    }
    cout << "-----" << endl << endl;

    cout << "hulaCount: " << hulaCount << ", notHulaCount: " << notHulaCount << endl << "-----" << endl << endl;
}

int main()
{
    ios_base::sync_with_stdio(0);

    cin >> n >> m >> q;
    for(int i = 0; i < m; ++i)
    {
        cin >> xx1 >> yy1 >> x2 >> y2;

        for(int j = xx1; j <= x2; ++j)
        {
            for(int k = yy1; k <= y2; ++k)
            {
                grid[j][k] = !grid[j][k];
            }
        }
    }

    calcSums();

    //printDebug();

    cout << solve() << endl;

    for(int i = 0; i < q; ++i)
    {
        cin >> a >> b;
        update();

        //printDebug();

        cout << solve() << endl;
    }

    return 0;
}