> #include <time.h>
> #include <stdio.h>
> 
> #define SECONDS 3600 * 24
> 
> int main( ) {
> 
> 	int n;
> 	time_t t;
> 	struct tm *newTime;
> 	char buff[80];
> 
> 	t = ( 365 * 30 + 7 ) * SECONDS;
> 
> 	while ( scanf( "%d", &n ) && n != -1 ) {
> 		t += n * SECONDS;
> 		//newTime = localtime( &t );
> 		newTime = gmtime( &t );
> 		t -= n * SECONDS;	
> 		strftime( buff, 80, "%Y-%m-%d %A", newTime );
> 		puts( buff );
> 	}
> 
> 	return 0;
> }