#include<stdio.h>
#include<stdlib.h>
unsigned long i,j,n,Q=1;
int main()
{
    FILE*f=fopen("fractii.in", "r");
    FILE*g=fopen("fractii.out","w");
    fscanf(f,"%lu",&n);   fclose(f);
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(i/j!=0&&i!=j) Q++,printf("%lu/%lu\n",i,j);
            if(j==1) Q++;
        }
    }
    fprintf(g,"%lu",Q);
    fclose(g);
    return 0;
}