#include <cstdio>
int main(){
    int n, k, i, j;
    FILE *fin, *fout;
    fin=fopen("tije.in", "r");
    fout=fopen("tije.out", "w");
    fscanf(fin, "%d", &n);
    k=n+1;
    while(n>1){
        for(i=0; i<n; i++)
            fprintf(fout, "%d %d\n", n, k);
        for(i=1; i<n; i++)
            fprintf(fout, "%d %d\n", i, n);
        for(i=1; i<=n; i++)
            fprintf(fout, "%d %d\n", k, i);
        for(i=1; i<n; i++){
            for(j=0; j<n; j++)
                fprintf(fout, "%d %d\n", i, k);
            fprintf(fout, "%d %d\n", i+1, i);
            for(j=1; j<n; j++)
                fprintf(fout, "%d %d\n", k, i);
            fprintf(fout, "%d %d\n", k, i+1);
        }
        n--;
    }
    fclose(fin);
    fclose(fout);
    return 0;
}