Read Assembly Code and Multiply the Value

Question

now I am learning about ARM code

STMFD SP!, {R4-R6,R10,R11,LR}
ADD R11, SP, #0x10
MOV R5, R0
MOV R4, R1
CMP R5, #0
BNE loc_10E348C
MOV R0, #0
BL sub_3D31B4