#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  string s;
  cin >> n >> s;
  int i;
  int counter = 0;
  int flag = 0;
  for (i = 0; i < n; i++)
    if (flag == 0) {
      if (s[i] == '#') flag = 1;
    } else {
      if (s[i] == '*') counter++;
    }
  cout << counter << endl;
}
