#include <stdio.h>

int main()
{
	int N;
	scanf("%d", &N);

	fwrite("0.", 1, N ? 2 : 1, stdout);
	for ( ; N > 0; N -= 6)
		fwrite("142857", 1, (N>6) ? 6 : N, stdout);
	putchar('\n');
	return 0;
}