'''
Created on 2011/09/25

@author: NSatoh
'''

tmpa = """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"""

tmpb = tmpa.split("\n")
# print tmpb
triangle = []
for i in range(len(tmpb)):
    tmpc = tmpb[i].split()
    for j in range(len(tmpc)):
        tmpc[j] = int(tmpc[j])
    triangle = triangle + [tmpc]

print triangle

for i in range(len(triangle)-2,-1,-1):
    for j in range(len(triangle[i])):
                   triangle[i][j] = triangle[i][j] + max(triangle[i+1][j],triangle[i+1][j+1])  

print triangle[0][0]  
