var
n,k,sum,d,i,j : integer;
begin
readln(n,k);
sum:=0;
for i:=1 to n do
d:=I*k
sum:= sum+ d;
end;
writeln(sum);
end.
var
n,k,sum,d,i,j : integer;
begin
readln(n,k);
sum:=0;
for i:=1 to n do
begin
d:=I*k
sum:= sum+ d;
end;
writeln(sum);
end.