1. For two consecutive days, Petya went to the store and each time bought buns for exactly 100 rubles. On the second day, the buns were one ruble more expensive than on the first day. The buns always cost an integer number of rubles.

How many buns did Petya buy over the two days? If there are multiple possible answers, list them in any order separated by a semicolon.

Examples of answer formats: 10

$10 ; 20$
Answer: $150 ; 45$ || $150 ; 45 ;|| 150,45$ || 45; 150 || 45, 150 || 45; 150 ;