addi x10, x0, 320
addi x1,  x0, 0
addi x2,  x0, 3
addi x3,  x0, 1
beq  x2,  x0, fail
loop:
add  x1,  x1, x2
sub  x2,  x2, x3
bne  x2,  x0, loop
beq  x1,  x1, done
addi x4,  x0, 99
done:
sw   x1,  0(x10)
sw   x2,  4(x10)
ebreak
fail:
addi x4,  x0, 77
sw   x4,  8(x10)
ebreak