uses
CRT;
var
n, i: integer;
pr: real;
begin
ClrScr;
write('N:= ');
readln(n);
pr := 1;
for i := 1 to n do
pr := pr * ((i * 2) / (2 * i + 1));
write('Pr:=', pr);
readkey
end.
uses
CRT;
var
n, i: integer;
pr: real;
begin
ClrScr;
write('N:= ');
readln(n);
pr := 1;
for i := 1 to n do
pr := pr * ((i * 2) / (2 * i + 1));
write('Pr:=', pr);
readkey
end.