Excel: Calculate the number of 1st of the months

I have two dates and need to calculate the number of 1st of the months between them. In order words if i have January 31, 2017 to March 2, 2017 it should output 2 February 2, 2017 to February 28, 2017 should output 0 January 1, 2017 to February 1, 2017 should also output 1, (I know this could look like two, which is why I wanted to point it out) Does anyone have any formula recommendations? Thanks!

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