#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'; }