#include <iostream>
using namespace std;
struct P{int x;int y;};P cp,r[502][502];int n,i,m,s,l,j,wx,wy,cc=1,ff=2;int b[502][502],v[502][502],c[502][502],fr[502][502];
P xy(P p,int ak){P wq;switch(ak){case 0:wq.x=p.x;wq.y=p.y+1;break;case 1:wq.x=p.x+1;wq.y=p.y;break;case 2:wq.x=p.x;wq.y=p.y-1;break;
case 3:wq.x=p.x-1;wq.y=p.y;break;}return wq;}int gh(P p){if((p.x==wx)&&(p.y==wy)&&l>2){l++;return 1;}return 0;}
int tw(P p){return fr[p.x][p.y]==0?0:fr[p.x][p.y]==ff?0:c[p.x][p.y]==cc?0:1;}
int aa(){int f=0;s=(s+1)%4;for(int z=0;z<4;z++){P g=xy(cp,s);if(gh(g)){
while((cp.x!=wx)||(cp.y!=wy)){v[cp.x][cp.y]=1;cp=r[cp.x][cp.y];}
v[cp.x][cp.y]=1;return 1;}if(tw(g)){P h=cp;cp=g;r[cp.x][cp.y]=h;c[h.x][h.y]=cc;l++;f=1;break;}s=(s+3)%4;}
if(!f){fr[cp.x][cp.y]=ff;l--;cp=r[cp.x][cp.y];}return 0;}
int main(){cin>>n>>m;char st[m+1];for(j=0;j<m+2;j++)b[0][j]=0;
for(i=1;i<n+1;i++){b[i][0]=0;cin>>st;for(j=1;j<m+1;j++)b[i][j]=st[j-1]=='1'?1:0;b[i][m+1]=0;}for(j=0;j<m+2;j++)
b[n+1][j]=0;for(i=1;i<n+1;i++)for(j=1;j<m+1;j++)if(!b[i-1][j]&&!b[i+1][j]&&!b[i][j-1]&&!b[i][j+1])
b[i][j]=0;else{int ii=i;int jj=j;while(b[ii-1][jj]+b[ii+1][jj]+b[ii][jj-1]+b[ii][jj+1]==1){
b[ii][jj]=0;if(b[ii-1][jj])ii=ii-1;else if(b[ii+1][jj])ii=ii+1;else if(b[ii][jj-1])jj=jj-1;else jj=jj+1;}}
for(i=1;i<n+1;i++)for(j=1;j<m+1;j++){v[i][j]=0;c[i][j]=0;fr[i][j]=b[i][j];}for(i=1;i<n+1;i++)
for(j=1;j<m+1;j++)if(b[i][j]&&b[i+1][j]&&b[i][j+1]&&b[i+1][j+1])v[i][j]=1;
for(i=1;i<n+1;i++)for(j=1;j<m+1;j++){if(v[i][j]||!b[i][j])continue;l=s=0;cc++;ff++;
wx=i;wy=j;cp.x=wx;cp.y=wy;int e=0;while((fr[cp.x][cp.y]>0)&&(fr[cp.x][cp.y]<ff)&&!e)e=aa();
if(l>=4)v[i][j]=1;else{b[i][j]=0;for(int dd=0;dd<4;dd++){int ii,jj;switch(dd){
case 0:ii=i+1;jj=j;break;case 1:ii=i;jj=j+1;break;case 2:ii=i-1;jj=j;break;case 3:ii=i;jj=j-1;break;
}while(b[ii-1][jj]+b[ii+1][jj]+b[ii][jj-1]+b[ii][jj+1]==1){b[ii][jj]=0;
if(b[ii-1][jj])ii=ii-1;else if(b[ii+1][jj])ii=ii+1;else if(b[ii][jj-1])jj=jj-1;
else jj=jj+1;}}}}int k=0;for(i=1;i<n+1;i++)for(j=1;j<m+1;j++)if(v[i][j])k++;cout<<k;return 0;}