User blog comment:Nayuta Ito/Brainfuck challenge/@comment-24725252-20160812202028/@comment-187.216.87.194-20160812214839

the first and second cells are initially increased to 4 : ++++ and >++++

then the first cell is decreased to 3 and then you loop back to increasing the second cell by 4 again

] can only loop on a nonzero cell, once the first cell is decreased to zero the program moves to the second cell, prints out its value and then halts,

n[>m<-]>. effectively computes n*m

where n stands for n +'s and m stands for m +'s