Two Mushroom Pickers

Two mushroom pickers traverse an N \times N square matrix, where rows and columns are numbered from $1$ to $N$. The first picker starts at cell $(1,1)$ and moves along the main diagonal to cell (N, N). The second picker begins at cell $(1,N)$ and travels along the secondary diagonal to cell $(N,1)$. Each cell $(i,j)$ contains 10i+j mushrooms. For instance, in a 4 \times 4 matrix, the mushroom counts are as follows:

As the pickers move through each cell, they collect all the mushrooms present. Calculate the total number of mushrooms collected by both pickers.