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

int main()
{
    int n = 20, c;
    srand (time(NULL));
    FILE * out = fopen("1552.in", "w");

    fprintf(out, "%d\n", n);
    while(n--)
    {
        c = rand() % 501;
        fprintf(out, "%d\n", c);
        for(int i = 0; i < c; i++)
            fprintf(out, "%d %d\n", rand() % 10001, rand() % 10001);

    }
    return 0;
}