def is_ok c1, c2, c3, lack
    if c1 == 0 then c1 = lack
    elsif c2 == 0 then c2 = lack
    else c3 = lack
    end
    return false if c1 == c2 or c2 == c3 or c3 == c1
    [c1, c2, c3].max == c2 or [c1, c2, c3].min == c2
end

c1, c2, c3 = gets.chomp.split.map &:to_i
print 1 if is_ok c1, c2, c3, 1
print 4 if is_ok c1, c2, c3, 4
puts