PE67

table = [ s.split() for s in open('triangles.txt').readlines()]
for row in range(len(table)-1,0,-1):
    for col in range(0,row):
        table[row-1][col] = int(table[row-1][col]) + max(int(table[row][col]),int(table[row][col+1]))
print(table[0][0])