Conditional mean on the left half

Let $X$ be a random variable with probability density function $$f(x)=\begin{cases}3x^2& \text{if }0<x<1,\ 0& \text{otherwise.}\end{cases}$$ Let $\delta$ denote the conditional expectation of $X$ given that $X\le\frac12$. Then the value of $80\delta$ is equal to __________ (answer in integer)