cls
a=int(rnd*4+1)
b=int(rnd*100+1)
c=int(rnd*100+1)
if a=1 then print b;"+";c;"=":goto 10
if a=2 then print b;"-";c;"=":goto 10
if a=3 then print b;"*";c;"=":goto 10
if a=4 then print b;"/";c;"=":goto 10
10 input d
if a=1 then if d=b+c then print "yes" else print "no"
if a=2 then if d=b-c then print "yes" else print "no"
if a=3 then if d=b*c then print "yes" else print "no"
if a=4 then if d=b/c then print "yes" else print "no"
end