Triangles

You are given 3 sticks of length $a$, $b$ and $c$. You would like to form a triangle (with positive area) using those sticks. Since, the initial sticks might not be able to form a triangle, we can choose any stick and increase its length by $1$. This operation can be performed any number of times. You need to find the minimum number of operations to be performed to get a triangle (with positive