Lua两个table中B中所有元素大于等于A中每个元素的个数

A={5,10,15,20,25,30,35,40,45,50}

B={5,10,15,20}
local ret=0
for i=1,#A do
   res=true;
   for j=1,#B do
       if (B[j]<A[i]) then
           res=false
           break
       end
   end
   if (res) then
       ret=ret+1
       print("s")
   end
end
print(ret)