PROBLEMA NUM: 4952 - CATEGORIA: generici - DIFFICOLTA': ***

Vijay made 4 stacks of wooden blocks. The first stack was 7 blocks tall. The second stack was 4 blocks taller than the first. The third stack was 7 blocks shorter than the second stack, and the last stack was 5 blocks taller than the third stack.
How many blocks did Vijay use in all?