#include <cstdio>
#include <cstdlib>

int main()
{
    int n, i;
    char cmd[100];
    scanf("%d", &n);
    for( i = 1 ; i <= n ; i++ )
    {
        sprintf(cmd, "ren %d.in .%d.in",i ,i);
        system(cmd);
        sprintf(cmd, "ren %d.out .%d.out", i, i);
        system(cmd);
    }
}