#include<stdio.h>

#define minim(a,b) (a<b ? a : b)

int n,m,nr;
int aj[506];
int v[503][503];

void recur(int px,int py,int lx,int ly)
{
    int i,j,l=aj[minim(lx,ly)];
    ++nr;
    for(i=1;i<=l;i++)
        for(j=1;j<=l;j++)
            v[i+px-1][j+py-1]=nr;
    if(l<ly)
        recur(px,py+l,lx,ly-l);
    if(l<lx)
        recur(px+l,py,lx-l,l);
}

int main ()
{
    int i,j;
    freopen("piese.in","r",stdin);
    freopen("piese.out","w",stdout);
    scanf("%d%d",&n,&m);
    aj[1]=1;
    for(i=2;i<=500;i++)
        if(i==2*aj[i-1])
            aj[i]=i;
        else
            aj[i]=aj[i-1];
    recur(1,1,n,m);
    printf("%d\n",nr);
    for(i=1;i<=n;i++ && printf("\n"))
        for(j=1;j<=m;j++)
            printf("%d ",v[i][j]);
    return 0;
}