#include <stdio.h>
#include <math.h>

struct Coords{
    float x;
    float y;
};

float distanse(float x1, float y1, float x2, float y2){
    return sqrt(pow((x2 - x1),2) + pow((y2 - y1),2));
};

int main(){
    int n;
    scanf("%d", &n);
    struct Coords point[n];
    printf("\n");
    for(int i = 0; i < n; i++){
        printf("%d: ", i + 1);
        scanf("%f %f", &point[i].x, &point[i].y);
    }

    for(int i = 0; i < n; i++){
        printf("\n%d\t", i + 1);
        for(int j = 0; j < n; j++){
            if(i == j)
                printf("X\t");
            else if(i < j)
                printf("%.2f\t", distanse(point[i].x, point[i].y, point[j].x, point[j].y));
            else
                printf("%.2f\t", -distanse(point[i].x, point[i].y, point[j].x, point[j].y));
        }
    }

  int num, num1, k=0, i=0;
  scanf("%d", &num);
  num1 = num;
  while(num1 > 0){
    num1 = num1/10;
    k++;
  }
  int arr[k];
  while(num > 0){
    arr[i] = num % 10;
    num = num/10;
    i++;
  }
  for (i=k-1; i>=0; i--){
    printf("%d", arr[i]);
  }
  return 0;
}