n,m=map(int,input().split())
l=[]
q=0
for i in range(n):
    a = list(map(int,input().split()))
    l.append(a)
for x in range(m):
   for y in range(n):
        b = min(l[y])
        q += b*(2**(x+1))
        l[y].remove(b)
print(q)