var
k,i,a,b,c1,c2,c3:integer;
begin
writeln('Vvedite a');
readln(a);
writeln('Vvedite b');
readln(b);
k:=0;
for i:=100 to 999 do
begin
c1:=i div 100;
c2:=i div 10 mod 10;
c3:=i mod 10;
if (c1+c2+c3=A)and(c3=B) then k:=k+1;
end;
write('K=',k);
end.