#include "artclass.h"
#include <bits/stdc++.h>
using namespace std;
#define type(x) __typeof((x).begin())
#define foreach(it, x) for(type(x) it = (x).begin(); it != (x).end(); it++)
typedef long long ll;
typedef pair < int, int > ii;
const int inf = 1e9 + 333;
const ll linf = 1e18 + inf;
const int N = 500;
int n, m, r[N][N], g[N][N], b[N][N];
ii root[N][N];
ii f(int x, int y) {
if(root[x][y] == ii(0, 0) or root[x][y] == ii(x, y))
return ii(x, y);
return root[x][y] = f(root[x][y].first, root[x][y].second);
}
void road(int x1, int y1, int x2, int y2, int k) {
bool flag = 0;
if(x2 < n and y2 < m) {
flag = 1;
flag &= abs(r[x1][y1] - r[x2][y2]) <= k;
flag &= abs(g[x1][y1] - g[x2][y2]) <= k;
flag &= abs(b[x1][y1] - b[x2][y2]) <= k;
}
if(flag) {
int X1 = f(x1, y1).first;
int Y1 = f(x1, y1).second;
int X2 = f(x2, y2).first;
int Y2 = f(x2, y2).second;
root[X1][Y1] = ii(X2, Y2);
}
}
bool h[N][N];
int style(int n, int m, int R[500][500], int G[500][500], int B[500][500]) {
:: n = n;
:: m = m;
for(int i = 0; i < n; i++) {
for(int j = 0; j < m; j++) {
r[i][j] = R[i][j];
g[i][j] = G[i][j];
b[i][j] = B[i][j];
}
}
//printf("n = %d m = %d\n", n, m);
for(int i = 0; i < n; i++) {
for(int j = 0; j < m; j++) {
road(i, j, i, j + 1, 20);
road(i, j, i + 1, j, 20);
}
}
set < ii > cntr;
multiset < ii > cntrMul;
for(int i = 0; i < n; i++) {
for(int j = 0; j < m; j++) {
cntr.insert(f(i, j));
cntrMul.insert(f(i, j));
}
}
if(cntr.size() <= 100)
return 4;
int bigs = 0;
for(int i = 0; i < n; i++) {
for(int j = 0; j < m; j++) {
int x = f(i, j).first;
int y = f(i, j).second;
if(!h[x][y]) {
h[x][y] = 1;
if(cntrMul.count(ii(x, y)) >= 1000) {
bigs++;
}
}
}
}
//printf("bigs = %d\n", bigs);
//printf("cntr = %d\n", (int) cntr.size());
if(bigs >= 15)
return 1;
return 3;
}
