#include<stdio.h>
#include<time.h>
#include<sys/time.h>
#include<math.h>

main()
{
	double secs,date;
	struct timeval tp;
	struct timezone tzp;

	gettimeofday(&tp, &tzp);
	secs = ((double) tp.tv_sec + (double) tp.tv_usec / 1000000.0);
	date = 1970. + secs/31557600.;
	printf("%11.6f\n",date);
}