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N,M=map(int,input().split()) a=[] b=[[0]*(M+1) for i in range(N+1)] for i in range(N): a.append(list(map(int,input().split()))) for i in range(1,N+1): for j in range(1,M+1): b[i][j]=a[i-1][j-1] + max(b[i-1][j],b[i][j-1]) print(b[-1][-1])