Marinada '23

[lang=hr] Prvo dijete ima $2$ bombona, drugo $5$, treće $8$ i tako svako sljedeće dijete ima po tri bombona više od prethodnog. Koliko zajedno bombona ima $30$ djece? [/lang] [lang=en] The first child has $2$ candies, the second $5$, the third $8$ and each following child has three more candies than the previous one. How many candies do $30$ children have all together? [/lang]