function words(w1, w2, day: integer): integer;
var
today: integer;
begin
today := (w1 + w2) div 2 + 2;
if (50 <= today) then
words := day
else
words := words(w2, today, day + 1);
end;
begin
writeLn('Незнайко продержался ', words(1, 1, 3), ' дней.');
end.
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