var
n,i,a,sum:longint;
begin
writeln('a = ');
readln(a);
writeln('n = ');
readln(n);
sum:=1;
for i:= 1 to n do
sum:= sum*(a+i);
writeln(sum);
end.
var
n,i,a,sum:longint;
begin
writeln('a = ');
readln(a);
writeln('n = ');
readln(n);
sum:=1;
for i:= 1 to n do
sum:= sum*(a+i);
writeln(sum);
end.