题解 | #单组_二维数组#

import sys

a = sys.stdin.readline().strip().split()

row = int(a[0])
col = int(a[1])

total_sum = 0

for x in range(row):
    line = sys.stdin.readline().strip().split()
    total_sum += sum(list(map(int, line)))
print(total_sum)