local mmi, mma = math.min, math.max
local h, w = io.read("*n", "*n")
local a = {}
for i = 1, h do
  a[i] = {}
  for j = 1, w do
    a[i][j] = io.read("*n")
  end
end
local t1, t2 = {}, {}
for i = 1, h do
  t1[i], t2[i] = {}, {}
  for j = 1, w do
    t1[i][j], t2[i][j] = 0, 0
  end
end

t1[1][1] = a[1][1]
for i = 1, h do
  for j = 1, w do
    if 0 < t1[i][j] then
      if i < h then
        if (i + 1) * j ~= h * w then t2[i + 1][j] = mma(t2[i + 1][j], t1[i][j]) end
        if a[i + 1][j] < t1[i][j] then
          t1[i + 1][j] = mma(t1[i + 1][j], a[i + 1][j] + t1[i][j])
        end
      end
      if j < w then
        if i * (j + 1) ~= h * w then t2[i][j + 1] = mma(t2[i][j + 1], t1[i][j]) end
        if a[i][j + 1] < t1[i][j] then
          t1[i][j + 1] = mma(t1[i][j + 1], a[i][j + 1] + t1[i][j])
        end
      end
    end
    if 0 < t2[i][j] then
      if i < h then
        if a[i + 1][j] < t2[i][j] then
          t2[i + 1][j] = mma(t2[i + 1][j], a[i + 1][j] + t2[i][j])
        end
      end
      if j < w then
        if a[i][j + 1] < t2[i][j] then
          t2[i][j + 1] = mma(t2[i][j + 1], a[i][j + 1] + t2[i][j])
        end
      end
    end
  end
end
print((0 < t1[h][w] or 0 < t2[h][w]) and "Yes" or "No")