#include <iostream>
using namespace std;
int main() {
	int n, e, k=0, m, maxk = 0, maxn = 1000000000, p = 1;
	cin >> e;
	while (e -- > 0) {
		cin >> n;
		if (p <= n) {
			m = n;
			k = 0;
			while ((n % 10) == 0) {
				//считает нули
				n = n / 10;
				k ++;
			}
			if (maxk < k) {
				maxn = m;
				maxk = k;
				p = 1;
				for (int i = 1; i < maxk; i ++) {
					p *= 10;
				}
			} else if (maxk == k) {
				if(maxn > m) {
					maxn = m;
				}
			}
		}
	}
	cout << maxn;
	return 0;
}

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NAoxMDAwMDAwCjEwMDAwMDAwCjEwMDAwMDAKMTAwMDAKIA==

4
1000000
10000000
1000000
10000