MDIGITS2 - First Number
Tác giả: ladpro98
Ngôn ngữ: Pascal
program mdigits2;
uses sysutils;
var s:ansistring;
i,n :longint;
begin
readln(n);
for i:=1 to n do
s:=s+inttostr(i);
write(pos(inttostr(n),s));
end.