# Enter your code here. Read input from STDIN. Print output to STDOUT
a = gets.strip.split(' ').map(&:to_i)
b = gets.strip.split(' ').map(&:to_i)
c = gets.strip.split(' ').map(&:to_i)


diff1 = 15 - a.inject(0) {|e,n| e+n }
diff2 = 15 - b.inject(0) {|e,n| e+n }
diff3 = 15 - c.inject(0) {|e,n| e+n }
diff4 = 15 - a[0] - b[0] - c[0]
diff5 = 15 - a[1] - b[1] - c[1]
diff6 = 15 - a[2] - b[2] - c[2]

puts [diff1,diff2,diff3,diff4,diff5,diff6].reject {|n| n==0}.map(&:abs).min