#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
using namespace std;

#define ll long long
#define INF (1 << 30)
#define INFLL (1LL << 60)

int main() {
    string str;
    cin >> str;
    int how = 0,ans = 0;
    cin >> str;
    for(int i = 0;i < str.size();i++){
        if(str[i] == '…') how++;
        else{
            ans = max(ans,how);
            how = 0;
        }
    }
    cout << how << endl;
    return 0;
}