#include <bits/stdc++.h>
#include "artclass.h"
template <class T> using Vec = std::vector<T>;
int solve(const int N, const Vec<int> R, const Vec<int> G, const Vec<int> B, const std::array<int, 4> D) {
int sum = 0, cnt = 0;
for (int i = 0; i < N; ++i) {
for (const auto d: D) {
const auto j = i + d;
if (0 <= j and j < N) {
sum += std::abs(R[i] - R[j]) + std::abs(G[i] - G[j]) + std::abs(B[i] - B[j]);
cnt += 1;
}
}
}
// std::cerr << std::fixed << std::setprecision(10);
// std::cerr << (double) sum / cnt << std::endl;
if (sum <= 9 * cnt) {
return 4;
}
if (sum <= 24 * cnt) {
return 1;
}
if (sum >= 55 * cnt) {
return 3;
}
return 2;
}
int style(int H, int W, int R[500][500], int G[500][500], int B[500][500]) {
const int N = H * W;
Vec<int> r(N), g(N), b(N);
for (int i = 0; i < H; ++i) {
for (int j = 0; j < W; ++j) {
r[i * W + j] = R[i][j];
g[i * W + j] = G[i][j];
b[i * W + j] = B[i][j];
}
}
return solve(N, r, g, b, std::array<int, 4>{W, 1, -W, -1});
}
