#include <bits/stdc++.h>
#define int long long
#define vt vector
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define ff first
#define ss second
#define dbg(x) cerr << #x << " = " << x << '\n'
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vvi = vt< vt<int> >;
const int N = 1e6 + 5, mod = 1e9 + 7, inf = 1e18 + 7, B = 500, LIM = (1ll << 20);
const double eps = 1e-6;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
void solve () {
int n, m, k;
cin >> n >> m >> k;
for (int i = 1; i <= k; i++) cin >> n >> m;
cout << (rng() % k);
cout << '\n';
}
bool testcases = 0;
signed main() {
cin.tie(0) -> sync_with_stdio(0);
int test = 1;
if (testcases) cin >> test;
for (int cs = 1; cs <= test; cs++) {
solve();
}
}
