#include<cstdio>
#define v(x,y,z) (x[(y-1)*m+z])
const int N=1000086;
int n,m,qh=1,qt=0,ans,q[N],a[N],b[N],cnt[N];
bool del[N<<2];
int read(){
	char ch=getchar();int nn=0,ssss=1;
	while(ch<'0'||ch>'9'){if(ch=='-')ssss*=-1;ch=getchar();}
	while(ch>='0'&&ch<='9'){nn=nn*10+(ch-'0');ch=getchar();}
	return nn*ssss;
}
bool build(int k,int l,int r){
	if(l==r){
		for(int i=1;i<=m;i++){cnt[l]+=(v(a,l,i)==0);v(del,k,i)=(v(a,l,i)==0);}
		if(cnt[l]==m)q[++qt]=l;return true;
	}
	int mid=(l+r)>>1;build(k<<1,l,mid);build(k<<1|1,mid+1,r);
	for(int i=1;i<=m;i++)v(del,k,i)=v(del,k<<1,i)&v(del,k<<1|1,i);
	return true;
}
bool change(int k,int l,int r,int x,int f){
	if(l==r){
		v(a,l,f)-=v(b,x,f);v(del,k,f)=(v(a,l,f)<=0);
		cnt[l]+=v(del,k,f);if(cnt[l]==m)q[++qt]=l;return true;
	}
	int mid=(l+r)>>1;
	if(!v(del,k<<1,f))change(k<<1,l,mid,x,f);
	if(!v(del,k<<1|1,f))change(k<<1|1,mid+1,r,x,f);
	v(del,k,f)=v(del,k<<1,f)&v(del,k<<1|1,f);return true;
}
int main(){
	n=read();m=read();
	for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)v(a,i,j)=read();
	build(1,1,n);
	for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)v(b,i,j)=read();
	while(qh<=qt){
		int np=q[qh++];ans++;
		for(int i=1;i<=m;i++)change(1,1,n,np,i);
	}
	printf("%d",ans);
}