id,first_name,department,gross_salary
1,Kolya,Sales,100000
2,Ira,Marketing,100000
3,Nina,HR,150000
4,Arkadiy,IT,300000
5,Innokentiy,IT,100000
6,Kollbek,IT,133000
7,Nastya,HR,60000
8,Lena,IT,98000
9,Masha,IT,98000
10,Masha,Marketing,98000
11,Igor,Marketing,50000
12,Masha,Sales,98000
13,Mayya,Sales,20000