User inputs one row of knitting instructions, program outputs number of stitches.

Values
dd=-2
di=+2
k2t=-1
k2tog=-1
m1=+1
m1l=+1
K(x)=x
o=+1
P(x)=x
P2t=-1
P2t=-1
psso=-1
skp= -1
skpo= -1
sl(x)=x
sl(x)k=x
sl(x)k(y)psso=y-x
sl(x)wyif=x
sl(1)k2togpsso= -2 
sl(1)k3togpsso= -3
ssk=-1
ssp=-1
sssk=-2
ssw=0
syif=0
yo=+1
yo twice=+2
(yo)2=+2

