What operation does the following machine instruction perform?

$\backslash$table$[[$lw $ to$,$ o$($$t$1)$:$,1000110100101000,0000000000000000,$$zero:,$00000],[$sw $to$,0($$$t1)$:$,1010110100101000,0000000000000000,$$to:$,01000],[$addi $t$0,$ $t$1,15$:$,0010000100101000,0000000000001111,$$t$1$:$,01001],[$add $t$0,$ $t$1,$ $t$2$:$,0000000100101010,0100000000100000,$$$12$:$,01010],[$sub $t$0,$ $t$1,$ $t$2$:$,0000000100101010,0100000000100010,$$t$3$:$,01011],[$mult $t$1,$ $t$2$:$,00010001001010100,0000000000011000,$$$14$:$,01100],[$mflo $to:$,00000000000000,0100000000010010,$$ $$5$:$,01101],[$j Jlabel:,$00001000000000,000101,$$t$6$:$,01110]]$

mult

sub

add

mflo