title: Monday count only
body: <p>I just want to count the dates Monday of each number in column C filtered by column A. But it is giving an error in the formula:</p>
  
  <pre><code>=NETWORKDAYS.INTL (JANEIRO!C2, "1"; FEVEREIRO!C2, "1 ")
  </code></pre>
  
  <p><a href="https://drive.google.com/open?id=1W3_OXuu2LYKMJZA_ET_A9nivDCRW1xv-pSsUINVCh6c" rel="nofollow noreferrer">drive link here</a></p>