összeadtam
"összeadtam" is the first-person singular past tense form of the Hungarian verb "összead." The verb "összead" generally translates to "to add up," "to sum," or "to combine." Therefore, "összeadtam" specifically means "I added up," "I summed," or "I combined."
In a mathematical context, "összeadtam" would be used when an individual has performed an addition of numbers.