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