#include<bits/stdc++.h>
using namespace std;
const int N = 110;
int  n, m, x, i, j,ans,k,b;
char s[N][N];
int main() {
	cin >> n >> m>>x;
	for (i = 0; i < n; i++)cin >> s[i];
	for (i = 0; i < n; i++) {
		for (j = 0; j < m; j++) {
			if (i + x >= n && j + x >= m) {
				b = 1;
				break;
			}
			if (j + x <= m) {
				for (k = 0; k < x; k++) 
					if (s[i][k + j] != '.')
						break;//横向
				if (k==x) ans++;				
			}
			if (i + x <= n) {
				for (k = 0; k < x; k++)
					if (s[i+k][j] != '.')
						break;//纵向
				if (k == x) ans++;
			}
		}if (b)break;
	}
  	if(x==1)ans/=2;
	cout << ans;
}