题解 | #单组_二维数组#

import sys
idx = 0
sum_all = 0
for line in sys.stdin:
    a = line.split()
    if idx == 0:
        x = int(a[0])
        y = int(a[1])
    else:
        one_line = [int(m) for m in a]
        sum_one_line = sum(one_line)
        sum_all += sum_one_line
    idx += 1
print(sum_all)