#include <iostream>
using namespace std;
int main()
{
    int num = 1, max1 = 0, max2 = 0;
    while (num != 0) {
        cin >> num;
        if (num > max2) {
            if (num > max1) {
                max2 = max1;
                max1 = num;
            }
            else
                max2 = num;
        }
    }
    cout << max2;
    return 0;
}