i have data that looks like the following:

2 7
1 5
2 7
1 4
2 7

I need a formula that will find how many time the number 7 is in the right
column and add up the corresponding number in the left column. So the answer
for this example would be 6, found 3 sevens in right column so added 2+2+2.
I tried an index(...,match( but couldnt get it to work. Please help.
Thanks.

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