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uses math, strutils, sysutils;
var
inv: string;
b: byte;
n: string;
function permbase(
base: byte;
index: longint
): string;
var
i: byte = 1;
begin
while base ** i <= index do
begin
index := index - base ** i;
inc(i)
end;
permbase := dec2numb(index, i, base)
end;
function invpermbase(
base: byte;
value: string
): longint;
begin
invpermbase := (base ** length(value) - base) div (base - 1) +
numb2dec(value, base)
end;
begin
(*
* Input format:
* <invert?>
* <base> <value>
*)
readln(inv);
readln(b, n);
n := delspace(n);
if strtobool(inv) then
writeln(invpermbase(b, n))
else
writeln(permbase(b, strtoint(n)))
end.
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