#include <bits/stdc++.h>
#define int long long
using namespace std;
void IOS() {
	ios::sync_with_stdio (false);
	cin.tie (0);
	cout.tie (0);
}
inline void read (int &x) {
	int s = 0, w = 1;
	char ch = getchar();
	while (ch < '0' || ch > '9') {
		if (ch == '-') w = -1;
		ch = getchar();
	}
	while (ch >= '0' && ch <= '9') s = s * 10 + ch - '0', ch = getchar();
	x = s * w;
}
set<int> s;
int n, x;
char ch;
signed main() {
	cin >> n;
	s.insert (0);
	while (n--) {
		cin >> ch >> x;
		if (ch == '+') {
			s.insert (x);
		} else if (ch == '?') {
			int t = 0;
			while (++t) {
				if (!s.count (t * x) ) {
					cout << t * x << '\n';
					break;
				}
			}
		}
	}
	return 0;
}