taikula

#include <iostream>
#include <cstdio>
using namespace std;
bool map[1100][1100];
int dxy[4][2] = {{0, 1}, {1, 0}, {-1, 0}, {0, -1}};
bool check(int x, int y){
    if(map[x][y] == 0){
        return false;
    }
    int point = 0;
    for(int i = 0; i < 4; i++){
        if(map[x + dxy[i][0]][y + dxy[i][1]] && x + dxy[i][0] >= 0 && x + dxy[i][0] <= 1000 && y + dxy[i][1] >= 0 && y + dxy[i][1] <= 1000){
            point++;
        }
    }
    return point == 3 ? true : false;
}
int main(){
	int n;
	cin >> n;
	int ans = 0;
	for(int i = 1; i <= n; i++){
		int x, y;
		cin >> x >> y;
		for(int j = 0; j < 4; j++){
			if(check(x + dxy[j][0], y + dxy[j][1])){
				map[x][y] = 1;
				if(check(x + dxy[j][0], y + dxy[j][1])){
					map[x][y] = 0;
				}else{
					ans--;
					map[x][y] = 0;
				}
			}else{
				map[x][y] = 1;
				if(check(x + dxy[j][0], y + dxy[j][1])){
					ans++; 
					map[x][y] = 0;
				}else{
					map[x][y] = 0;
				}
			}
		}
		map[x][y] = 1;
		if(check(x, y)){
            ans++;
        }
		cout << ans << endl;
	}
	return 0;
}