const n = 3;
const n1 = 5;
var a, sin_a, f, stepen: real;
factorial,factorial1: longint;
i,i1: byte;
begin
writeln('введите а: ');
readln(a);
factorial:= 1;
factorial1:= 1;
for i := 2 to n do
factorial:= factorial * i;
for i1:= 2 to n1 do
factorial1:= factorial1 * i1;
sin_a:=a-(power(a,n)/factorial);
writeln(sin_a);
end.