import sys
def main():
    llist = list()
    for _ in range(3):
        llist.append(list(map(int,sys.stdin.readline().split())))
    _sum = list()
    for x in llist:
        _sum.append(sum(x))
    for x in range(3):
        s = 0
        for y in range(3):
            s+=llist[y][x]
        _sum.append(s)
    ulist = list()
    for x in _sum:
        ulist.append((_sum.count(x),x))
    res = max(ulist)[1]
    index = []
    for i in range(len(_sum)):
        if(_sum[i]<res):
            index.append(i)
    row,col = index[0],index[1]-3
    print(abs(res-_sum[row]))

main()