usaco18open lemonade line

using namespace std;
int n, w[100005];
int (){
    scanf("%d", &n);
    for(int i = 0; i < n; ++i)
        scanf("%d", &w[i]);
    sort(w, w + n);
    int cnt = 0;
    for(int i = n - 1; i >= 0; --i){
        if(cnt <= w[i])
            cnt++;
        else
            break;
    }
    printf("%dn", cnt);
    return 0;
}