#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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