#include<bits/stdc++.h>
using namespace std;

/*P3654 First Step (ファーストステップ)--模拟+枚举*/
int r, c, k, flag = 0, num = 0;
char a[105][105];
int main() {
	cin >> r >> c >> k;
	for (int i = 1; i <= r; i++) {
		for (int j = 1; j <= c; j++) {
			cin >> a[i][j];
		}
	}
	//枚举行
	for (int i = 1; i <= r; i++) {
		for (int j = 1; j <= c; j++) {
			if (a[i][j] == '.') {
				flag++;
			}
			if (flag == k) {
				flag = 0;
				num++;
				break;
			}
		}
		flag = 0;
	}
	//枚举列
	for (int i = 1; i <= r; i++) {
		for (int j = 1; j <= c; j++) {
			if (a[j][i] == '.') {
				flag++;
			}
			if (flag == k) {
				flag = 0;
				num++;
				break;
			}
		}
		flag = 0;
	}
	cout << num;
	return 0;
}