#include <stdio.h>
#include <stdlib.h>
int main()
{
    char cmd[100];
    int n;
    scanf("%d", &n);
    freopen(".info","w",stdout);
    printf("%d\n1000",n);
    for(int i=1 ; i <= n ; i++ )
    {
        sprintf(cmd, "ren input%d.txt .%d.in", i, i);
        system(cmd);
        sprintf(cmd, "ren output%d.txt .%d.out",i, i);
        system(cmd);
    }
}