program p1(input,output);
var a,b,k:integer;
function summ(a,b,k:integer):integer;
var i:integer; s:integer;
function in_k(c,k:integer):boolean;
label 99;
var p:integer;
begin
while c<>0 do begin
p:=c;
c:=c mod 10;
if c=k then begin in_k:=true; goto 99 end
else c:=p div 10;
end;
in_k:=false;
99: end;
begin
s:=0;
for i:=a to b do
if in_k(i,k) then s:=s+i;
summ:=s;
end;
begin write('interval>');
readln(a,b);
write('k>');
readln(k);
write(summ(a,b,k));
readln;
readln;
end.