#include<stdio.h>
#include<stdlib.h>

int main(){
    int n;
    scanf("%d",&n);
    
    // constraints
    if(n<0 || n>50){
        printf("Invalid Input \nEnter a positive number and less than 50");
        return 0;
    }
    
    int i,j;
    int temp=n;
    for(i=n;i>0;i--){
        printf("-%d %d\n",i,i);
    }
    for(j=0;j<=temp;j++){
        printf("%d %d\n",j,j);
    }
    
    return 0;
}