How did there get three potatoes more plus a pancake when he only put out two potatoes and no pancake?

Misha wasn't the only one thieving. Janina was thieving too. She did not, however, disobey her father by going with Misha..... she went separately and alone.

It went that way night after night: through the wall, into Heaven (thanks to Enos, that’s what we were calling the other side of the wall), raiding kitchens, cellars, trash cans— separately. Like a good little girl, Janina was obeying her father: she did not go with me. She went on her own.