1 #include <iostream>
2 #include <math.h>
3 using namespace std;
4
5 typedef struct Dot
6 {
7 int x;
8 int y;
9 }Dot;
10
11 Dot dot[4];
12 int main()
13 {
14
15 int targetShock = 0;
16 int R = 0;
17 cin >> R;
18 for (int i = 0; i < 8; i++)
19 {
20 if (i % 2 == 0)
21 {
22 cin >> dot[i / 2].x;
23 }
24 else
25 {
26 cin >> dot[i / 2].y;
27 }
28
29 }
30
31 int targetX = dot[3].x;
32 int targetY = dot[3].y;
33
34 for (int i = 0; i < 3; i++)
35 {
36 int dis = pow(dot[i].x - targetX, 2) + pow(dot[i].y - targetY, 2);
37 if (dis <= pow(R, 2))
38 {
39 targetShock++;
40 }
41
42 }
43
44 cout << targetShock << "X";
45
46
47 return 0;
48 }
