while 1:
n, m = map(int, input().split())
if n == m == 0:
break
l = []
for i in range(m):
l.append([*map(int, input().split())])
ans = 0
for i in range(n):
d = 0
for j in range(m):
d += l[j][i]
ans = max(ans, d)
print(ans)