1)
var a,b,x,y:longint;
begin
write("Vvedite nachalo i konec otrezka: ");
read(a,b);
write("Vvedite x: ");
read(x);
y:=sqr(x)*x;
if (y>a)and(y<b) then write("Na dannom otrezke znachenie funkcii ravno ",y) else write("Na dannom otrezke net reshenii");
readln
end.
2)
var c,i:byte;
begin
for i:=49 to 215 do
if (i mod 4=0) then c:=c+1;
write("Kolichestvo chisel, kratnyh 4 na zadannom promezhutke ravno ",c);
readln
end.
3)
var i:integer;
p:longint;
for i:=1000 to 9999 do
if (i mod 10=3) then p:=p*i;
write("Proizvedenie chetyrehznachnyh chisel, okanchivaushihsya na 3 ravno ",p);
readln
end.
4)
var i:byte;
c:integer;
begin
for i:=221 to 778 do
if ((i mod 10)=(i div 100)) then c:=c+1;
write("Kolichestvo chisel ravno ",c);
readln
end.
5)
var i:longint;
c:integer;
begin
for i:=10000 to 99999 do
if ((i mod 10)=(i div 10000))and(((i mod 100)div 10)=((i div 1000)mod 10)) then c:=c+1;
write("Kolichestvo chisel ravno ",c);
readln
end.
n = int(input())
print(2*n**2 - 2*n +1)