Summing the lengths of lists inside a list in R

I have 2 lists inside a list in R. Each sublist contains a different number of dataframes. The data looks like this:

df1 <- data.frame(x = 1:5, y = letters[1:5])
df2 <- data.frame(x = 1:15, y = letters[1:15])
df3 <- data.frame(x = 1:25, y = letters[1:25])
df4 <- data.frame(x = 1:6, y = letters[1:6])
df5 <- data.frame(x = 1:8, y = letters[1:8])

l1 <- list(df1, df2)
l2 <- list(df3, df4, df5)
mylist <- list(l1, l2)

I want to count the total number of dataframes I have in mylist (answer should be 5, as I have 5 data frames in total).

>Solution :

Using lengths():

sum(lengths(mylist)) # 5

From the official documentation:

[…] a more efficient version of sapply(x, length)