c  The total flow:
s 13

c flow values:
f 0 6 3
f 0 1 0
f 0 2 10
f 1 5 1
f 1 0 0
f 1 3 0
f 2 4 4
f 2 3 6
f 2 0 0
f 3 7 5
f 3 2 0
f 3 1 1
f 4 5 4
f 4 6 0
f 5 4 0
f 5 7 5
f 6 7 3
f 6 4 0
f 7 6 0
f 7 5 0