def maxSequence(arr):
    if arr==[]:
        return 0
    summlocal=0
    summglobal=0
    for i in arr:
        if summlocal>=0:
            if summlocal+i <0:
               summlocal=0
            else:
               summlocal+=i
        summglobal=max(summlocal,summglobal)
    return summglobal