#include <iostream>
#include <cmath>
using namespace std;
 
int x[2001][2001];
 
int main() {
    int n;
    cin >> n;
    int pos;
    bool f = true;
    int x1 = 1001, y1 = 1001;
    for(int i = 0; i< n && f; i++) {
        cin >> pos;
        if(x[x1][y1] == 1) { 
            cout << i;
            f = false;
        }
        else x[x1][y1] = 1;
         switch (pos) {
            case 1: x1--; y1++; break;
            case 3: x1++;
            case 2: y1++; break;
            case 4: x1++; break;
            case 5: x1++;
            case 6: y1--; break;
            case 7: y1--; 
            case 8: x1--;
        }
    }
    if (f) cout << "Ok" << endl << abs(x1-1001) + abs(y1-1001);
    return 0;
}