#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;


int main() {
    int n;
    cin >> n;

    string s;
    cin >> s;

    int res = 0;
    for(int i = 0; i < n; i++) {
        if(s[i] == 'C') {
            for(int j = i + 1; j < n; j++) {
                if(s[j] == 'C') {
                    int a = 0, b = 0;
                    for(int k = i; k < j; k++) {
                        if(s[k] == 'A') {
                            a++;
                        }
                        else if(s[k] == 'B'){
                            b++;
                        }
                    }
                    if(a <= b) {
                        res++;
                    }
                    break;
                }
            }
        }
    }

    if(res == 0) {
        cout << "POGODENA" << endl;
    }
    else {
        cout << res << endl;
    }

    return 0;
}