#include <iostream>
using namespace std;

long long int a, mx1, mx2;
int main()
{
    cin >> a;
    while (a != 0)
    {
        if (a >= mx1)
        {
            mx2 = mx1;
            mx1 = a;
        }
        else if (a > mx2 && a != mx1)
            mx2 = a;
        cin >> a;
    }
    cout << mx2;
    return 0;
}