1 of 3

Bash, 69 bytes

bc<<<`fold -1|tr "\n "adgjmptwbehknquxcfilorvysz +1[1*8][2*8][3*8]44`

Try it online!

Folds one char per line, transliterates each newline with +, each space with 1 and each letter with the corresponding number of pushes. bc does the sum. For some reason direct pipe to bc gives input error.