class dsu():
    n=1
    parent_or_size=[-1 for i in range(n)]
    def __init__(self,N):
        self.n=N
        self.parent_or_size=[-1 for i in range(N)]
    def merge(self,a,b):
        assert 0<=a<self.n, "0<=a<n,a={0},n={1}".format(a,self.n)
        assert 0<=b<self.n, "0<=b<n,b={0},n={1}".format(b,self.n)
        x=self.leader(a)
        y=self.leader(b)
        if x==y:
            return False
        if (-self.parent_or_size[x]<-self.parent_or_size[y]):
            x,y=y,x
        self.parent_or_size[x]+=self.parent_or_size[y]
        self.parent_or_size[y]=x
        return True
    def same(self,a,b):
        assert 0<=a<self.n, "0<=a<n,a={0},n={1}".format(a,self.n)
        assert 0<=b<self.n, "0<=b<n,b={0},n={1}".format(b,self.n)
        return self.leader(a)==self.leader(b)
    def leader(self,a):
        assert 0<=a<self.n, "0<=a<n,a={0},n={1}".format(a,self.n)
        if (self.parent_or_size[a]<0):
            return a
        self.parent_or_size[a]=self.leader(self.parent_or_size[a])
        return self.parent_or_size[a]
    def size(self,a):
        assert 0<=a<self.n, "0<=a<n,a={0},n={1}".format(a,self.n)
        return -self.parent_or_size[self.leader(a)]
    def groups(self):
        leader_buf=[0 for i in range(self.n)]
        group_size=[0 for i in range(self.n)]
        for i in range(self.n):
            leader_buf[i]=self.leader(i)
            group_size[leader_buf[i]]+=1
        result=[[] for i in range(self.n)]
        for i in range(self.n):
            result[leader_buf[i]].append(i)
        result2=[]
        for i in range(self.n):
            if len(result[i])>0:
                result2.append(result[i])
        return result2

mod=998244353
H,W=map(int,input().split())
A=[list(map(int,input().split())) for i in range(H)]
D=dsu(H+W)
P=pow(2,H+W-1,mod)
Q=pow(2,mod-2,mod)
S=[]
for i in range(H):
  for j in range(W):
    S.append(A[i][j]*H*W+i*W+j)
S.append(0)
S.sort(reverse=True)
for i in range(H*W+1):
  S[i]=(S[i]//(H*W),(S[i]//W)%H,S[i]%W)
ANS=(P-1)*S[0][0]%mod
for i in range(H*W):
  x,y=S[i][1],S[i][2]
  z=S[i][0]-S[i+1][0]
  if D.merge(x,H+y):
    P=P*Q%mod
  if P==1:
    break
  ANS=(ANS-(P-1)*z)%mod
print(ANS%mod)