# -*- coding: utf-8 -*-
"""
Created on Thu May 22 13:56:23 2014

@author: etodorov
"""

inp = "75-95 64-17 47 82-18 35 87 10-20 04 82 47 65-19 01 23 75 03 34-88 02 77 73 07 63 67-99 65 04 28 06 16 70 92-41 41 26 56 83 40 80 70 33-41 48 72 33 47 32 37 16 94 29-53 71 44 65 25 43 91 52 97 51 14-70 11 33 28 77 73 17 78 39 68 17 57-91 71 52 38 17 14 91 43 58 50 27 29 48-63 66 04 68 89 53 67 30 73 16 69 87 40 31-04 62 98 27 23 09 70 98 73 93 38 53 60 04 23"
triangle = []
for i in inp.split("-"):
    temp = []
    for j in i.split(" "):
        temp.append(int(j))
    triangle.append(temp)

#sum with the bigger, starting from the bottom
c=0
for k in xrange(len(triangle)-1,0,-1):
    for l in xrange(len(triangle[k-1])):
        triangle[k-1][l]+=max(triangle[k][l],triangle[k][l+1])

print triangle[0][0]

