def maximum_Sum(list1):
     
    maxi = -100000
    for x in list1: 
        sum = 0 
        for y in x: 
            sum+= y      
        maxi = max(sum,maxi)     
    return maxi 
def maximum_Sum(list1):
    maxi = -100000
    for x in list1:
        sum = 0
       
        for y in x:
            sum += y
        maxi = max(sum, maxi)
    return maxi