Formula to count if cells in consecutive columns are populated

Hello,

I need an equation that will return a 1 in column F if data is available (cell is populated) in 2013 or last two years (2012 & 2013) or last three years (2011 & 2012 & 2013) or last four years or last five years. A zero counts as data.

Data is set up as:
Years in columns

2009 2010 2011 2012 2013 Count
product 1 34 32 33 31 35 1
product 2 40 1
product 3 15 16 15
product 4 66 67 1
product 5 55 67 78 1
product 6 90 1
product 7 26 27 26 27
product 8 54 64 74 84 1
product 9 87 98 99

Thank you!