const s = 'S = 2*X1 + 3*X2 / (X2 + 3*X1) / (X2 + 25*X1).';
var i, k: integer;
begin
k := 0;
for i := 1 to length(s) do begin
k += ord(s[i] = '*');
end;
writeln(k);
end.
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