#include <bits/stdc++.h>
const int INF = 2147483647;
const int INF2 = 0x3f3f3f3f;
const long long INF64 = (long long)2e18;
const double INFD = 1e30;
const double EPS = 1e-9;
const double PI = std::acos(-1);
const int MOD = 1e9 + 7;
template <typename T>
inline T read() {
  T X = 0, w = 0;
  char ch = 0;
  while (!isdigit(ch)) {
    w |= ch == '-';
    ch = getchar();
  }
  while (isdigit(ch)) X = (X << 3) + (X << 1) + (ch ^ 48), ch = getchar();
  return w ? -X : X;
}
const int MAXN = 1005;
const int MAXV = 1 << 20;
int n, m, k;
int dr[4] = {0, 1, 0, -1};
int dc[4] = {-1, 0, 1, 0};
int dr2[8] = {1, 1, 1, -1, -1, -1, 0, 0};
int dc2[8] = {1, 0, -1, 1, 0, -1, 1, -1};
int CASE = 1;
char S[MAXN];
int mp[MAXN][MAXN];
int main() {
  scanf("%d%d%d", &n, &m, &k);
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) {
      mp[i][j] = read<int>();
    }
  }
  std::vector<std::pair<int, int>> ans;
  for (int i = 1; i <= m; i++) {
    for (int j = i + 1; j <= m; j++) {
      ans.push_back(k == 0 ? (std::pair<int, int>){i, j}
                           : (std::pair<int, int>){j, i});
    }
  }
  printf("%d\n", ans.size());
  for (auto a : ans) {
    printf("%d %d\n", a.first, a.second);
  }
  return 0;
}
