r,a,b = gets.split().map(&:to_i).sort

a -= r
b -=r

if a*3 <= b
	r += a
	b -+ a*3
	r += b/5
else
	s = (b-a)/2
	r += s
	a -= s
	b -= s*3
	a -= 1 if (a+b)%8 == 4
	r += (a+b)/4
end

puts r