#include <bits/stdc++.h>
using namespace std;
#define TRACE(x) cerr << #x << " :: " << x << endl
#define _ << " " <<
#define SZ(x) (int)(x).size()
#define ALL(x) (x).begin(),(x).end()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for (int i=(a);i>=(b);--i)
const int mxN = 1000;
const int mxM = 10;
int N, M;
string G[mxN];
int main() {
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin >> N >> M;
int corner = 0, ed = 0;
int dy[] = {-1,0,1,0};
int dx[] = {0,1,0,-1};
FOR(i,0,N-1){
cin >> G[i];
}
FOR(i,0,N-1){
FOR(j,0,M-1) if (G[i][j] == '#') {
int c = 0;
int d[] = {0,0};
FOR(k,0,3){
int a = i+dy[k], b = j+dx[k];
if (a >= 0 && a < N && b >= 0 && b < M && G[a][b] == '#') {
d[c++] = k;
}
}
if (c == 1) ++ed;
else if (c == 2 && (d[0]-d[1])%2 != 0) ++corner;
}
}
cout << corner + ed/2 << '\n';
}
