let cupsOfSugarNeeded = 2;
let cupsAdded = 0;

do {
  cupsOfSugarNeeded = cupsOfSugarNeeded - cupsAdded;
  cupsAdded++;
  console.log(`Needed: ${cupsOfSugarNeeded}\n Added: ${cupsAdded}`);
} while (cupsAdded < cupsOfSugarNeeded);