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The first measurement of the inclusive cross section for top quark pairs($\mathrm{t\bar{t}}$) produced in association with two additional charm jets ispresented. The analysis uses the dileptonic final states of $\mathrm{t\bar{t}}$events produced in proton-proton collisions at a centre-of-mass energy of 13TeV. The data correspond to an integrated luminosity of 41.5 fb$^{-1}$,recorded by the CMS experiment at the LHC. A new charm jet identificationalgorithm provides input to a neural network that is trained to distinguishamong $\mathrm{t\bar{t}}$ events with two additional charm($\mathrm{t\bar{t}c\bar{c}}$), bottom ($\mathrm{t\bar{t}b\bar{b}}$), andlight-flavour or gluon ($\mathrm{t\bar{t}LL}$) jets. By means of a templatefitting procedure, the inclusive $\mathrm{t\bar{t}c\bar{c}}$,$\mathrm{t\bar{t}b\bar{b}}$, and $\mathrm{t\bar{t}LL}$ cross sections aresimultaneously measured, together with their ratios to the inclusive$\mathrm{t\bar{t}}$ + two jets cross section. This provides measurements of the$\mathrm{t\bar{t}c\bar{c}}$ and $\mathrm{t\bar{t}b\bar{b}}$ cross sections of10.1 $\pm$ 1.2 (stat) $\pm$ 1.4 (syst) pb and 4.54 $\pm$ 0.35 (stat) $\pm$ 0.56(syst) pb, respectively, in the full phase space. The results are compared andfound to be consistent with predictions from two different matrix elementgenerators with next-to-leading order accuracy in quantum chromodynamics,interfaced with a parton shower simulation.

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First measurement of the cross section for top quark pair production  with additional charm jets using dileptonic final states in pp collisions at  $\sqrt{s} = $ 13 TeV