import sys
import numpy as np



def main():
    h, w = map(int, input().split())
    A = np.fromstring(sys.stdin.read(), np.int64, sep=' ').reshape(-1, w)
    B = np.zeros_like(A, np.int64)
    C = np.zeros_like(A, np.int64)
    B[0, 0] = A[0, 0]
    for i in range(h):
        for j in range(w):
            if i == h - 1 and j == w - 1: continue
            a = A[i, j]
            if i:
                b = B[i - 1, j]
                c = C[i - 1, j]
                if b > a: B[i, j] = max(B[i, j], b + a)
                if c > a: C[i, j] = max(C[i, j], c + a)
                C[i, j] = max(C[i, j], b)
            if j:
                b = B[i, j - 1]
                c = C[i, j - 1]
                if b > a: B[i, j] = max(B[i, j], b + a)
                if c > a: C[i, j] = max(C[i, j], c + a)
                C[i, j] = max(C[i, j], b)
    print('Yes' if max(B[-2, -1], B[-1, -2], C[-2, -1], C[-1, -2]) > A[-1, -1] else 'No')

    



if __name__ == '__main__':
    main()