package main

import (
    "fmt"
    "strconv"
    "strings"
)

const t = `               55
                        94 48
                       95 30 96
                     77 71 26 67
                    97 13 76 38 45
                  07 36 79 16 37 68
                 48 07 09 18 70 26 06
               18 72 79 46 59 79 29 90
              20 76 87 11 32 07 07 49 18
            27 83 58 35 71 11 25 57 29 85
           14 64 36 96 27 11 58 56 92 18 55
         02 90 03 60 48 49 41 46 33 36 47 23
        92 50 48 02 36 59 42 79 72 20 82 77 42
      56 78 38 80 39 75 02 71 66 66 01 03 55 72
     44 25 67 84 71 67 11 61 40 57 58 89 40 56 36
   85 32 25 85 57 48 84 35 47 62 17 01 01 99 89 52
  06 71 28 75 94 48 37 10 23 51 06 48 53 18 74 98 15
27 02 92 23 08 71 76 84 15 52 92 63 81 10 44 10 69 93`

func main() {
    lines := strings.Split(t, "\n")
    f := strings.Fields(lines[len(lines)-1])
    d := make([]int, len(f))
    var err error
    for i, s := range f {
        if d[i], err = strconv.Atoi(s); err != nil {
            panic(err)
        }
    }
    d1 := d[1:]
    var l, r, u int
    for row := len(lines) - 2; row >= 0; row-- {
        l = d[0]
        for i, s := range strings.Fields(lines[row]) {
            if u, err = strconv.Atoi(s); err != nil {
                panic(err)
            }
            if r = d1[i]; l > r {
                d[i] = u + l
            } else {
                d[i] = u + r
            }
            l = r
        }
    }
    fmt.Println(d[0])
}