Segrif Var
 input, output: text;
 x,k: integer;
begin
 assign(input,'input.txt');
 assign(output,'output.txt');
 reset(input);
 rewrite(output);
 k := 0;
 read(input, x);
 while x <> 0 do
   begin
   k := k + 1;
   read(input, x)
   end;
 write(output, k);
 close(input);
 close(output)
end.