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From April to July 2018, a data sample at the peak energy of the$\Upsilon(4S)$ resonance was collected with the Belle~II detector at theSuperKEKB electron-positron collider. This is the first data sample of theBelle~II experiment. Using Bhabha and digamma events, we measure the integratedluminosity of the data sample to be ($496.3 \pm 0.3 \pm 3.0$)~pb$^{-1}$, wherethe first uncertainty is statistical and the second is systematic. This workprovides a basis for future luminosity measurements at Belle~II.

Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment