Only "7","0","+"allowed

Logic Level 3

A malfunction calculator can only perform calculation using "7","0""7", "0" and "+""+" keys. That means number such as "77707""77707" could still be keyed-in for the addition operation. What is the least number of times that the "7""7" key must be used in the addition process to view "222222""222222" on its screen?

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