import time
start=time.time()
import numpy as np
input ='75 0 0 0 0 0 0 0 0 0 0 0 0 0 0 \
95 64 0 0 0 0 0 0 0 0 0 0 0 0 0 \
17 47 82 0 0 0 0 0 0 0 0 0 0 0 0 \
18 35 87 10 0 0 0 0 0 0 0 0 0 0 0 \
20 04 82 47 65 0 0 0 0 0 0 0 0 0 0 \
19 01 23 75 03 34 0 0 0 0 0 0 0 0 0 \
88 02 77 73 07 63 67 0 0 0 0 0 0 0 0 \
99 65 04 28 06 16 70 92 0 0 0 0 0 0 0 \
41 41 26 56 83 40 80 70 33 0 0 0 0 0 0 \
41 48 72 33 47 32 37 16 94 29 0 0 0 0 0 \
53 71 44 65 25 43 91 52 97 51 14 0 0 0 0 \
70 11 33 28 77 73 17 78 39 68 17 57 0 0 0 \
91 71 52 38 17 14 91 43 58 50 27 29 48 0 0 \
63 66 04 68 89 53 67 30 73 16 69 87 40 31 0 \
04 62 98 27 23 09 70 98 73 93 38 53 60 04 23'
input_array=np.array(map(int,input.split(' '))).reshape(15,15)
print input_array
for i in range(len(input_array[:,0])-1,-1,-1):                                      
    for j in range(i):                             
        input_array[i-1,j]+=max(input_array[i,j],input_array[i,j+1])
print input_array[0,0]    
elapsed = (time.time()-start)
print 'time:', elapsed,'s'