Route #1: 54 55 41 57 56 39 68 40 38 37 69 67 66 65 64 62 63 59 58 61 60 34 31 32 Route #2: 36 11 1 15 14 Route #3: 35 33 18 19 2 17 13 16 12 71 6 10 8 7 9 4 3 5 Route #4: 23 24 26 25 49 70 51 50 47 48 52 45 53 43 44 46 42 27 28 22 21 30 29 20 Cost 237