Since pushing a variable essentially moves the stack pointer by a dword, the stack pointer is adjusted by adding 4 (the size of a dword) to it (line 32).
All subsequent arguments are accessed by adding the size of a dword variable to the stack pointer (that is, esp + 12, esp + 16, and so on).
Thus, to access a byte, a multiplier of 1 is used, for a word, 2, and for a dword, 4.
