How often does Valentine's day intersect Ash Wednesday?

This cut'n'paste might help. Or it might not!

In a regular year, the calendar repeats itself in a 28-year cycle. First it repeats after six years and then for two spans of 11 years. A calendar for a leap year repeats itself every 28 years. The calendars of both the second and third years repeat themselves in an 11-11-6year cycle.