#include <stdio.h>
bool f[3001][3001];
bool c[3001][3001];
int ans=0;
int h,w;

void check(short i,short j,bool aa){
    if ((i<0)||(i>=h)) return;
    if ((j<0)||(j>=w)) return;
    if (c[i][j]) return;
    else if (!f[i][j]) return;
    else if (aa) {
        ++ans;
    }
    c[i][j]=true;
    check(i-1,j,false);
    check(i+1,j,false);
    check(i,j-1,false);
    check(i,j+1,false);
}

int main() {
    scanf("%d %d", &h, &w);
    for (short i=0;i<h;i++) {
        for (short j=0;j<w;j++) {
            scanf("%d", &f[i][j]);
            c[i][j]=false;
        }
    }

    for (short i=0;i<h;i++) {
        for (short j=0;j<w;j++) {
            check(i,j,true);
        }
    }
    printf("%d\n",ans);
    return 0;
}