const

fi='TONG.INP';

fo='TONG.OUT';

var

i,n,tong:integer;

begin

assign(f,fi);reset(f);

read(f,n);

close(f);

assign(f,fo);

rewrite(f);

tong:=0;

for i:=1 to n do

tong:=tong+i*i;

write(f,tong);

close(f);

end.

const

fi='TONG.INP';

fo='TONG.OUT';