Untitled

m = int(input())

n = int(input())

mx = [0] * m
for i in range(m):
    mx[i] = [0] * n
s = input()
s = s.replace(" ", "")
for i in range(m):
    for j in range(n):
        mx[i][j] = s[0]
        s = s[1::]
for i in range(m):
    for j in range(n):
        if i == m-1:
            break
        if mx[i][j] == "0":
            mx[i+1][j] = "0"
k = 0
for i in range(m):
    for j in range(n):
        k += int(mx[i][j])
print(k)